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WSL2-Linux-Kernel
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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (49 commits)
  ext4: Avoid corrupting the uninitialized bit in the extent during truncate
  ext4: Don't treat a truncation of a zero-length file as replace-via-truncate
  ext4: fix dx_map_entry to support 256k directory blocks
  ext4: truncate the file properly if we fail to copy data from userspace
  ext4: Avoid leaking blocks after a block allocation failure
  ext4: Change all super.c messages to print the device
  ext4: Get rid of EXTEND_DISKSIZE flag of ext4_get_blocks_handle()
  ext4: super.c whitespace cleanup
  jbd2: Fix minor typos in comments in fs/jbd2/journal.c
  ext4: Clean up calls to ext4_get_group_desc()
  ext4: remove unused function __ext4_write_dirty_metadata
  ext2: Fix memory leak in ext2_fill_super() in case of a failed mount
  ext3: Fix memory leak in ext3_fill_super() in case of a failed mount
  ext4: Fix memory leak in ext4_fill_super() in case of a failed mount
  ext4: down i_data_sem only for read when walking tree for fiemap
  ext4: Add a comprehensive block validity check to ext4_get_blocks()
  ext4: Clean up ext4_get_blocks() so it does not depend on bh_result->b_state
  ext4: Merge ext4_da_get_block_write() into mpage_da_map_blocks()
  ext4: Add BUG_ON debugging checks to noalloc_get_block_write()
  ext4: Add documentation to the ext4_*get_block* functions
  ...
This commit is contained in:
Linus Torvalds 2009-06-11 10:00:50 -07:00
Родитель 27951daa71 a41f207169
Коммит e893123c73
23 изменённых файлов: 1586 добавлений и 1237 удалений
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2
fs/buffer.c
Просмотреть файл

@ -2935,6 +2935,8 @@ int submit_bh(int rw, struct buffer_head * bh)
BUG_ON(!buffer_locked(bh));
BUG_ON(!buffer_mapped(bh));
BUG_ON(!bh->b_end_io);
BUG_ON(buffer_delay(bh));
BUG_ON(buffer_unwritten(bh));
/*
* Mask in barrier bit for a write (could be either a WRITE or a

1
fs/ext2/super.c
Просмотреть файл

@ -1093,6 +1093,7 @@ failed_mount:
brelse(bh);
failed_sbi:
sb->s_fs_info = NULL;
kfree(sbi->s_blockgroup_lock);
kfree(sbi);
return ret;
}

1
fs/ext3/super.c
Просмотреть файл

@ -2021,6 +2021,7 @@ failed_mount:
brelse(bh);
out_fail:
sb->s_fs_info = NULL;
kfree(sbi->s_blockgroup_lock);
kfree(sbi);
lock_kernel();
return ret;

4
fs/ext4/Makefile
Просмотреть файл

@ -5,8 +5,8 @@
obj-$(CONFIG_EXT4_FS) += ext4.o
ext4-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
ioctl.o namei.o super.o symlink.o hash.o resize.o extents.o \
ext4_jbd2.o migrate.o mballoc.o
ioctl.o namei.o super.o symlink.o hash.o resize.o extents.o \
ext4_jbd2.o migrate.o mballoc.o block_validity.o
ext4-$(CONFIG_EXT4_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o
ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o

28
fs/ext4/balloc.c
Просмотреть файл

@ -19,7 +19,6 @@
#include <linux/buffer_head.h>
#include "ext4.h"
#include "ext4_jbd2.h"
#include "group.h"
#include "mballoc.h"
/*
@ -88,6 +87,7 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
ext4_group_t block_group, struct ext4_group_desc *gdp)
{
int bit, bit_max;
ext4_group_t ngroups = ext4_get_groups_count(sb);
unsigned free_blocks, group_blocks;
struct ext4_sb_info *sbi = EXT4_SB(sb);
@ -123,7 +123,7 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
bit_max += ext4_bg_num_gdb(sb, block_group);
}
if (block_group == sbi->s_groups_count - 1) {
if (block_group == ngroups - 1) {
/*
* Even though mke2fs always initialize first and last group
* if some other tool enabled the EXT4_BG_BLOCK_UNINIT we need
@ -131,7 +131,7 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
*/
group_blocks = ext4_blocks_count(sbi->s_es) -
le32_to_cpu(sbi->s_es->s_first_data_block) -
(EXT4_BLOCKS_PER_GROUP(sb) * (sbi->s_groups_count - 1));
(EXT4_BLOCKS_PER_GROUP(sb) * (ngroups - 1));
} else {
group_blocks = EXT4_BLOCKS_PER_GROUP(sb);
}
@ -205,18 +205,18 @@ struct ext4_group_desc * ext4_get_group_desc(struct super_block *sb,
{
unsigned int group_desc;
unsigned int offset;
ext4_group_t ngroups = ext4_get_groups_count(sb);
struct ext4_group_desc *desc;
struct ext4_sb_info *sbi = EXT4_SB(sb);
if (block_group >= sbi->s_groups_count) {
if (block_group >= ngroups) {
ext4_error(sb, "ext4_get_group_desc",
"block_group >= groups_count - "
"block_group = %u, groups_count = %u",
block_group, sbi->s_groups_count);
block_group, ngroups);
return NULL;
}
smp_rmb();
group_desc = block_group >> EXT4_DESC_PER_BLOCK_BITS(sb);
offset = block_group & (EXT4_DESC_PER_BLOCK(sb) - 1);
@ -326,16 +326,16 @@ ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group)
unlock_buffer(bh);
return bh;
}
spin_lock(sb_bgl_lock(EXT4_SB(sb), block_group));
ext4_lock_group(sb, block_group);
if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
ext4_init_block_bitmap(sb, bh, block_group, desc);
set_bitmap_uptodate(bh);
set_buffer_uptodate(bh);
spin_unlock(sb_bgl_lock(EXT4_SB(sb), block_group));
ext4_unlock_group(sb, block_group);
unlock_buffer(bh);
return bh;
}
spin_unlock(sb_bgl_lock(EXT4_SB(sb), block_group));
ext4_unlock_group(sb, block_group);
if (buffer_uptodate(bh)) {
/*
* if not uninit if bh is uptodate,
@ -451,7 +451,7 @@ void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
down_write(&grp->alloc_sem);
for (i = 0, blocks_freed = 0; i < count; i++) {
BUFFER_TRACE(bitmap_bh, "clear bit");
if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group),
if (!ext4_clear_bit_atomic(ext4_group_lock_ptr(sb, block_group),
bit + i, bitmap_bh->b_data)) {
ext4_error(sb, __func__,
"bit already cleared for block %llu",
@ -461,11 +461,11 @@ void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
blocks_freed++;
}
}
spin_lock(sb_bgl_lock(sbi, block_group));
ext4_lock_group(sb, block_group);
blk_free_count = blocks_freed + ext4_free_blks_count(sb, desc);
ext4_free_blks_set(sb, desc, blk_free_count);
desc->bg_checksum = ext4_group_desc_csum(sbi, block_group, desc);
spin_unlock(sb_bgl_lock(sbi, block_group));
ext4_unlock_group(sb, block_group);
percpu_counter_add(&sbi->s_freeblocks_counter, blocks_freed);
if (sbi->s_log_groups_per_flex) {
@ -665,7 +665,7 @@ ext4_fsblk_t ext4_count_free_blocks(struct super_block *sb)
ext4_fsblk_t desc_count;
struct ext4_group_desc *gdp;
ext4_group_t i;
ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
ext4_group_t ngroups = ext4_get_groups_count(sb);
#ifdef EXT4FS_DEBUG
struct ext4_super_block *es;
ext4_fsblk_t bitmap_count;
@ -677,7 +677,6 @@ ext4_fsblk_t ext4_count_free_blocks(struct super_block *sb)
bitmap_count = 0;
gdp = NULL;
smp_rmb();
for (i = 0; i < ngroups; i++) {
gdp = ext4_get_group_desc(sb, i, NULL);
if (!gdp)
@ -700,7 +699,6 @@ ext4_fsblk_t ext4_count_free_blocks(struct super_block *sb)
return bitmap_count;
#else
desc_count = 0;
smp_rmb();
for (i = 0; i < ngroups; i++) {
gdp = ext4_get_group_desc(sb, i, NULL);
if (!gdp)

244
fs/ext4/block_validity.c Normal file
Просмотреть файл

@ -0,0 +1,244 @@
/*
* linux/fs/ext4/block_validity.c
*
* Copyright (C) 2009
* Theodore Ts'o (tytso@mit.edu)
*
* Track which blocks in the filesystem are metadata blocks that
* should never be used as data blocks by files or directories.
*/
#include <linux/time.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/quotaops.h>
#include <linux/buffer_head.h>
#include <linux/module.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/version.h>
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include "ext4.h"
struct ext4_system_zone {
struct rb_node node;
ext4_fsblk_t start_blk;
unsigned int count;
};
static struct kmem_cache *ext4_system_zone_cachep;
int __init init_ext4_system_zone(void)
{
ext4_system_zone_cachep = KMEM_CACHE(ext4_system_zone,
SLAB_RECLAIM_ACCOUNT);
if (ext4_system_zone_cachep == NULL)
return -ENOMEM;
return 0;
}
void exit_ext4_system_zone(void)
{
kmem_cache_destroy(ext4_system_zone_cachep);
}
static inline int can_merge(struct ext4_system_zone *entry1,
struct ext4_system_zone *entry2)
{
if ((entry1->start_blk + entry1->count) == entry2->start_blk)
return 1;
return 0;
}
/*
* Mark a range of blocks as belonging to the "system zone" --- that
* is, filesystem metadata blocks which should never be used by
* inodes.
*/
static int add_system_zone(struct ext4_sb_info *sbi,
ext4_fsblk_t start_blk,
unsigned int count)
{
struct ext4_system_zone *new_entry = NULL, *entry;
struct rb_node **n = &sbi->system_blks.rb_node, *node;
struct rb_node *parent = NULL, *new_node = NULL;
while (*n) {
parent = *n;
entry = rb_entry(parent, struct ext4_system_zone, node);
if (start_blk < entry->start_blk)
n = &(*n)->rb_left;
else if (start_blk >= (entry->start_blk + entry->count))
n = &(*n)->rb_right;
else {
if (start_blk + count > (entry->start_blk +
entry->count))
entry->count = (start_blk + count -
entry->start_blk);
new_node = *n;
new_entry = rb_entry(new_node, struct ext4_system_zone,
node);
break;
}
}
if (!new_entry) {
new_entry = kmem_cache_alloc(ext4_system_zone_cachep,
GFP_KERNEL);
if (!new_entry)
return -ENOMEM;
new_entry->start_blk = start_blk;
new_entry->count = count;
new_node = &new_entry->node;
rb_link_node(new_node, parent, n);
rb_insert_color(new_node, &sbi->system_blks);
}
/* Can we merge to the left? */
node = rb_prev(new_node);
if (node) {
entry = rb_entry(node, struct ext4_system_zone, node);
if (can_merge(entry, new_entry)) {
new_entry->start_blk = entry->start_blk;
new_entry->count += entry->count;
rb_erase(node, &sbi->system_blks);
kmem_cache_free(ext4_system_zone_cachep, entry);
}
}
/* Can we merge to the right? */
node = rb_next(new_node);
if (node) {
entry = rb_entry(node, struct ext4_system_zone, node);
if (can_merge(new_entry, entry)) {
new_entry->count += entry->count;
rb_erase(node, &sbi->system_blks);
kmem_cache_free(ext4_system_zone_cachep, entry);
}
}
return 0;
}
static void debug_print_tree(struct ext4_sb_info *sbi)
{
struct rb_node *node;
struct ext4_system_zone *entry;
int first = 1;
printk(KERN_INFO "System zones: ");
node = rb_first(&sbi->system_blks);
while (node) {
entry = rb_entry(node, struct ext4_system_zone, node);
printk("%s%llu-%llu", first ? "" : ", ",
entry->start_blk, entry->start_blk + entry->count - 1);
first = 0;
node = rb_next(node);
}
printk("\n");
}
int ext4_setup_system_zone(struct super_block *sb)
{
ext4_group_t ngroups = ext4_get_groups_count(sb);
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_group_desc *gdp;
ext4_group_t i;
int flex_size = ext4_flex_bg_size(sbi);
int ret;
if (!test_opt(sb, BLOCK_VALIDITY)) {
if (EXT4_SB(sb)->system_blks.rb_node)
ext4_release_system_zone(sb);
return 0;
}
if (EXT4_SB(sb)->system_blks.rb_node)
return 0;
for (i=0; i < ngroups; i++) {
if (ext4_bg_has_super(sb, i) &&
((i < 5) || ((i % flex_size) == 0)))
add_system_zone(sbi, ext4_group_first_block_no(sb, i),
sbi->s_gdb_count + 1);
gdp = ext4_get_group_desc(sb, i, NULL);
ret = add_system_zone(sbi, ext4_block_bitmap(sb, gdp), 1);
if (ret)
return ret;
ret = add_system_zone(sbi, ext4_inode_bitmap(sb, gdp), 1);
if (ret)
return ret;
ret = add_system_zone(sbi, ext4_inode_table(sb, gdp),
sbi->s_itb_per_group);
if (ret)
return ret;
}
if (test_opt(sb, DEBUG))
debug_print_tree(EXT4_SB(sb));
return 0;
}
/* Called when the filesystem is unmounted */
void ext4_release_system_zone(struct super_block *sb)
{
struct rb_node *n = EXT4_SB(sb)->system_blks.rb_node;
struct rb_node *parent;
struct ext4_system_zone *entry;
while (n) {
/* Do the node's children first */
if (n->rb_left) {
n = n->rb_left;
continue;
}
if (n->rb_right) {
n = n->rb_right;
continue;
}
/*
* The node has no children; free it, and then zero
* out parent's link to it. Finally go to the
* beginning of the loop and try to free the parent
* node.
*/
parent = rb_parent(n);
entry = rb_entry(n, struct ext4_system_zone, node);
kmem_cache_free(ext4_system_zone_cachep, entry);
if (!parent)
EXT4_SB(sb)->system_blks.rb_node = NULL;
else if (parent->rb_left == n)
parent->rb_left = NULL;
else if (parent->rb_right == n)
parent->rb_right = NULL;
n = parent;
}
EXT4_SB(sb)->system_blks.rb_node = NULL;
}
/*
* Returns 1 if the passed-in block region (start_blk,
* start_blk+count) is valid; 0 if some part of the block region
* overlaps with filesystem metadata blocks.
*/
int ext4_data_block_valid(struct ext4_sb_info *sbi, ext4_fsblk_t start_blk,
unsigned int count)
{
struct ext4_system_zone *entry;
struct rb_node *n = sbi->system_blks.rb_node;
if ((start_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||
(start_blk + count > ext4_blocks_count(sbi->s_es)))
return 0;
while (n) {
entry = rb_entry(n, struct ext4_system_zone, node);
if (start_blk + count - 1 < entry->start_blk)
n = n->rb_left;
else if (start_blk >= (entry->start_blk + entry->count))
n = n->rb_right;
else
return 0;
}
return 1;
}

3
fs/ext4/dir.c
Просмотреть файл

@ -131,8 +131,7 @@ static int ext4_readdir(struct file *filp,
struct buffer_head *bh = NULL;
map_bh.b_state = 0;
err = ext4_get_blocks_wrap(NULL, inode, blk, 1, &map_bh,
0, 0, 0);
err = ext4_get_blocks(NULL, inode, blk, 1, &map_bh, 0);
if (err > 0) {
pgoff_t index = map_bh.b_blocknr >>
(PAGE_CACHE_SHIFT - inode->i_blkbits);

356
fs/ext4/ext4.h
Просмотреть файл

@ -21,7 +21,14 @@
#include <linux/magic.h>
#include <linux/jbd2.h>
#include <linux/quota.h>
#include "ext4_i.h"
#include <linux/rwsem.h>
#include <linux/rbtree.h>
#include <linux/seqlock.h>
#include <linux/mutex.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/blockgroup_lock.h>
#include <linux/percpu_counter.h>
/*
* The fourth extended filesystem constants/structures
@ -46,6 +53,19 @@
#define ext4_debug(f, a...) do {} while (0)
#endif
/* data type for block offset of block group */
typedef int ext4_grpblk_t;
/* data type for filesystem-wide blocks number */
typedef unsigned long long ext4_fsblk_t;
/* data type for file logical block number */
typedef __u32 ext4_lblk_t;
/* data type for block group number */
typedef unsigned int ext4_group_t;
/* prefer goal again. length */
#define EXT4_MB_HINT_MERGE 1
/* blocks already reserved */
@ -179,9 +199,6 @@ struct flex_groups {
#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
#ifdef __KERNEL__
#include "ext4_sb.h"
#endif
/*
* Macro-instructions used to manage group descriptors
*/
@ -297,10 +314,23 @@ struct ext4_new_group_data {
};
/*
* Following is used by preallocation code to tell get_blocks() that we
* want uninitialzed extents.
* Flags used by ext4_get_blocks()
*/
#define EXT4_CREATE_UNINITIALIZED_EXT 2
/* Allocate any needed blocks and/or convert an unitialized
extent to be an initialized ext4 */
#define EXT4_GET_BLOCKS_CREATE 0x0001
/* Request the creation of an unitialized extent */
#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
EXT4_GET_BLOCKS_CREATE)
/* Caller is from the delayed allocation writeout path,
so set the magic i_delalloc_reserve_flag after taking the
inode allocation semaphore for */
#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
/* Call ext4_da_update_reserve_space() after successfully
allocating the blocks */
#define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008
/*
* ioctl commands
@ -515,6 +545,110 @@ do { \
#endif /* defined(__KERNEL__) || defined(__linux__) */
/*
* storage for cached extent
*/
struct ext4_ext_cache {
ext4_fsblk_t ec_start;
ext4_lblk_t ec_block;
__u32 ec_len; /* must be 32bit to return holes */
__u32 ec_type;
};
/*
* fourth extended file system inode data in memory
*/
struct ext4_inode_info {
__le32 i_data[15]; /* unconverted */
__u32 i_flags;
ext4_fsblk_t i_file_acl;
__u32 i_dtime;
/*
* i_block_group is the number of the block group which contains
* this file's inode. Constant across the lifetime of the inode,
* it is ued for making block allocation decisions - we try to
* place a file's data blocks near its inode block, and new inodes
* near to their parent directory's inode.
*/
ext4_group_t i_block_group;
__u32 i_state; /* Dynamic state flags for ext4 */
ext4_lblk_t i_dir_start_lookup;
#ifdef CONFIG_EXT4_FS_XATTR
/*
* Extended attributes can be read independently of the main file
* data. Taking i_mutex even when reading would cause contention
* between readers of EAs and writers of regular file data, so
* instead we synchronize on xattr_sem when reading or changing
* EAs.
*/
struct rw_semaphore xattr_sem;
#endif
#ifdef CONFIG_EXT4_FS_POSIX_ACL
struct posix_acl *i_acl;
struct posix_acl *i_default_acl;
#endif
struct list_head i_orphan; /* unlinked but open inodes */
/*
* i_disksize keeps track of what the inode size is ON DISK, not
* in memory. During truncate, i_size is set to the new size by
* the VFS prior to calling ext4_truncate(), but the filesystem won't
* set i_disksize to 0 until the truncate is actually under way.
*
* The intent is that i_disksize always represents the blocks which
* are used by this file. This allows recovery to restart truncate
* on orphans if we crash during truncate. We actually write i_disksize
* into the on-disk inode when writing inodes out, instead of i_size.
*
* The only time when i_disksize and i_size may be different is when
* a truncate is in progress. The only things which change i_disksize
* are ext4_get_block (growth) and ext4_truncate (shrinkth).
*/
loff_t i_disksize;
/*
* i_data_sem is for serialising ext4_truncate() against
* ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
* data tree are chopped off during truncate. We can't do that in
* ext4 because whenever we perform intermediate commits during
* truncate, the inode and all the metadata blocks *must* be in a
* consistent state which allows truncation of the orphans to restart
* during recovery. Hence we must fix the get_block-vs-truncate race
* by other means, so we have i_data_sem.
*/
struct rw_semaphore i_data_sem;
struct inode vfs_inode;
struct jbd2_inode jinode;
struct ext4_ext_cache i_cached_extent;
/*
* File creation time. Its function is same as that of
* struct timespec i_{a,c,m}time in the generic inode.
*/
struct timespec i_crtime;
/* mballoc */
struct list_head i_prealloc_list;
spinlock_t i_prealloc_lock;
/* ialloc */
ext4_group_t i_last_alloc_group;
/* allocation reservation info for delalloc */
unsigned int i_reserved_data_blocks;
unsigned int i_reserved_meta_blocks;
unsigned int i_allocated_meta_blocks;
unsigned short i_delalloc_reserved_flag;
/* on-disk additional length */
__u16 i_extra_isize;
spinlock_t i_block_reservation_lock;
};
/*
* File system states
*/
@ -560,6 +694,7 @@ do { \
#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
#ifndef _LINUX_EXT2_FS_H
@ -689,6 +824,137 @@ struct ext4_super_block {
};
#ifdef __KERNEL__
/*
* fourth extended-fs super-block data in memory
*/
struct ext4_sb_info {
unsigned long s_desc_size; /* Size of a group descriptor in bytes */
unsigned long s_inodes_per_block;/* Number of inodes per block */
unsigned long s_blocks_per_group;/* Number of blocks in a group */
unsigned long s_inodes_per_group;/* Number of inodes in a group */
unsigned long s_itb_per_group; /* Number of inode table blocks per group */
unsigned long s_gdb_count; /* Number of group descriptor blocks */
unsigned long s_desc_per_block; /* Number of group descriptors per block */
ext4_group_t s_groups_count; /* Number of groups in the fs */
unsigned long s_overhead_last; /* Last calculated overhead */
unsigned long s_blocks_last; /* Last seen block count */
loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
struct buffer_head * s_sbh; /* Buffer containing the super block */
struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
struct buffer_head **s_group_desc;
unsigned long s_mount_opt;
ext4_fsblk_t s_sb_block;
uid_t s_resuid;
gid_t s_resgid;
unsigned short s_mount_state;
unsigned short s_pad;
int s_addr_per_block_bits;
int s_desc_per_block_bits;
int s_inode_size;
int s_first_ino;
unsigned int s_inode_readahead_blks;
spinlock_t s_next_gen_lock;
u32 s_next_generation;
u32 s_hash_seed[4];
int s_def_hash_version;
int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
struct percpu_counter s_freeblocks_counter;
struct percpu_counter s_freeinodes_counter;
struct percpu_counter s_dirs_counter;
struct percpu_counter s_dirtyblocks_counter;
struct blockgroup_lock *s_blockgroup_lock;
struct proc_dir_entry *s_proc;
struct kobject s_kobj;
struct completion s_kobj_unregister;
/* Journaling */
struct inode *s_journal_inode;
struct journal_s *s_journal;
struct list_head s_orphan;
struct mutex s_orphan_lock;
struct mutex s_resize_lock;
unsigned long s_commit_interval;
u32 s_max_batch_time;
u32 s_min_batch_time;
struct block_device *journal_bdev;
#ifdef CONFIG_JBD2_DEBUG
struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
#endif
#ifdef CONFIG_QUOTA
char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
int s_jquota_fmt; /* Format of quota to use */
#endif
unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
struct rb_root system_blks;
#ifdef EXTENTS_STATS
/* ext4 extents stats */
unsigned long s_ext_min;
unsigned long s_ext_max;
unsigned long s_depth_max;
spinlock_t s_ext_stats_lock;
unsigned long s_ext_blocks;
unsigned long s_ext_extents;
#endif
/* for buddy allocator */
struct ext4_group_info ***s_group_info;
struct inode *s_buddy_cache;
long s_blocks_reserved;
spinlock_t s_reserve_lock;
spinlock_t s_md_lock;
tid_t s_last_transaction;
unsigned short *s_mb_offsets;
unsigned int *s_mb_maxs;
/* tunables */
unsigned long s_stripe;
unsigned int s_mb_stream_request;
unsigned int s_mb_max_to_scan;
unsigned int s_mb_min_to_scan;
unsigned int s_mb_stats;
unsigned int s_mb_order2_reqs;
unsigned int s_mb_group_prealloc;
/* where last allocation was done - for stream allocation */
unsigned long s_mb_last_group;
unsigned long s_mb_last_start;
/* history to debug policy */
struct ext4_mb_history *s_mb_history;
int s_mb_history_cur;
int s_mb_history_max;
int s_mb_history_num;
spinlock_t s_mb_history_lock;
int s_mb_history_filter;
/* stats for buddy allocator */
spinlock_t s_mb_pa_lock;
atomic_t s_bal_reqs; /* number of reqs with len > 1 */
atomic_t s_bal_success; /* we found long enough chunks */
atomic_t s_bal_allocated; /* in blocks */
atomic_t s_bal_ex_scanned; /* total extents scanned */
atomic_t s_bal_goals; /* goal hits */
atomic_t s_bal_breaks; /* too long searches */
atomic_t s_bal_2orders; /* 2^order hits */
spinlock_t s_bal_lock;
unsigned long s_mb_buddies_generated;
unsigned long long s_mb_generation_time;
atomic_t s_mb_lost_chunks;
atomic_t s_mb_preallocated;
atomic_t s_mb_discarded;
/* locality groups */
struct ext4_locality_group *s_locality_groups;
/* for write statistics */
unsigned long s_sectors_written_start;
u64 s_kbytes_written;
unsigned int s_log_groups_per_flex;
struct flex_groups *s_flex_groups;
};
static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
{
return sb->s_fs_info;
@ -704,7 +970,6 @@ static inline struct timespec ext4_current_time(struct inode *inode)
current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
}
static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
{
return ino == EXT4_ROOT_INO ||
@ -1014,6 +1279,14 @@ extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
ext4_group_t block_group,
struct buffer_head ** bh);
extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
ext4_group_t block_group);
extern unsigned ext4_init_block_bitmap(struct super_block *sb,
struct buffer_head *bh,
ext4_group_t group,
struct ext4_group_desc *desc);
#define ext4_free_blocks_after_init(sb, group, desc) \
ext4_init_block_bitmap(sb, NULL, group, desc)
/* dir.c */
extern int ext4_check_dir_entry(const char *, struct inode *,
@ -1038,6 +1311,11 @@ extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
extern unsigned long ext4_count_free_inodes(struct super_block *);
extern unsigned long ext4_count_dirs(struct super_block *);
extern void ext4_check_inodes_bitmap(struct super_block *);
extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
struct buffer_head *bh,
ext4_group_t group,
struct ext4_group_desc *desc);
extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
/* mballoc.c */
extern long ext4_mb_stats;
@ -1123,6 +1401,8 @@ extern void ext4_abort(struct super_block *, const char *, const char *, ...)
__attribute__ ((format (printf, 3, 4)));
extern void ext4_warning(struct super_block *, const char *, const char *, ...)
__attribute__ ((format (printf, 3, 4)));
extern void ext4_msg(struct super_block *, const char *, const char *, ...)
__attribute__ ((format (printf, 3, 4)));
extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
const char *, const char *, ...)
__attribute__ ((format (printf, 4, 5)));
@ -1161,6 +1441,10 @@ extern void ext4_used_dirs_set(struct super_block *sb,
struct ext4_group_desc *bg, __u32 count);
extern void ext4_itable_unused_set(struct super_block *sb,
struct ext4_group_desc *bg, __u32 count);
extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
struct ext4_group_desc *gdp);
extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
struct ext4_group_desc *gdp);
static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
{
@ -1228,6 +1512,18 @@ struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
return grp_info[indexv][indexh];
}
/*
* Reading s_groups_count requires using smp_rmb() afterwards. See
* the locking protocol documented in the comments of ext4_group_add()
* in resize.c
*/
static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
{
ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
smp_rmb();
return ngroups;
}
static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
ext4_group_t block_group)
@ -1283,33 +1579,25 @@ struct ext4_group_info {
};
#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
#define EXT4_GROUP_INFO_LOCKED_BIT 1
#define EXT4_MB_GRP_NEED_INIT(grp) \
(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
ext4_group_t group)
{
return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
}
static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
{
struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
spin_lock(ext4_group_lock_ptr(sb, group));
}
static inline void ext4_unlock_group(struct super_block *sb,
ext4_group_t group)
{
struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
}
static inline int ext4_is_group_locked(struct super_block *sb,
ext4_group_t group)
{
struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
&(grinfo->bb_state));
spin_unlock(ext4_group_lock_ptr(sb, group));
}
/*
@ -1326,11 +1614,21 @@ extern const struct file_operations ext4_file_operations;
/* namei.c */
extern const struct inode_operations ext4_dir_inode_operations;
extern const struct inode_operations ext4_special_inode_operations;
extern struct dentry *ext4_get_parent(struct dentry *child);
/* symlink.c */
extern const struct inode_operations ext4_symlink_inode_operations;
extern const struct inode_operations ext4_fast_symlink_inode_operations;
/* block_validity */
extern void ext4_release_system_zone(struct super_block *sb);
extern int ext4_setup_system_zone(struct super_block *sb);
extern int __init init_ext4_system_zone(void);
extern void exit_ext4_system_zone(void);
extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
ext4_fsblk_t start_blk,
unsigned int count);
/* extents.c */
extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
@ -1338,17 +1636,15 @@ extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
int chunk);
extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock, unsigned int max_blocks,
struct buffer_head *bh_result,
int create, int extend_disksize);
struct buffer_head *bh_result, int flags);
extern void ext4_ext_truncate(struct inode *);
extern void ext4_ext_init(struct super_block *);
extern void ext4_ext_release(struct super_block *);
extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
loff_t len);
extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
sector_t block, unsigned int max_blocks,
struct buffer_head *bh, int create,
int extend_disksize, int flag);
extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
sector_t block, unsigned int max_blocks,
struct buffer_head *bh, int flags);
extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len);

140
fs/ext4/ext4_i.h
Просмотреть файл

@ -1,140 +0,0 @@
/*
* ext4_i.h
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/include/linux/minix_fs_i.h
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#ifndef _EXT4_I
#define _EXT4_I
#include <linux/rwsem.h>
#include <linux/rbtree.h>
#include <linux/seqlock.h>
#include <linux/mutex.h>
/* data type for block offset of block group */
typedef int ext4_grpblk_t;
/* data type for filesystem-wide blocks number */
typedef unsigned long long ext4_fsblk_t;
/* data type for file logical block number */
typedef __u32 ext4_lblk_t;
/* data type for block group number */
typedef unsigned int ext4_group_t;
/*
* storage for cached extent
*/
struct ext4_ext_cache {
ext4_fsblk_t ec_start;
ext4_lblk_t ec_block;
__u32 ec_len; /* must be 32bit to return holes */
__u32 ec_type;
};
/*
* fourth extended file system inode data in memory
*/
struct ext4_inode_info {
__le32 i_data[15]; /* unconverted */
__u32 i_flags;
ext4_fsblk_t i_file_acl;
__u32 i_dtime;
/*
* i_block_group is the number of the block group which contains
* this file's inode. Constant across the lifetime of the inode,
* it is ued for making block allocation decisions - we try to
* place a file's data blocks near its inode block, and new inodes
* near to their parent directory's inode.
*/
ext4_group_t i_block_group;
__u32 i_state; /* Dynamic state flags for ext4 */
ext4_lblk_t i_dir_start_lookup;
#ifdef CONFIG_EXT4_FS_XATTR
/*
* Extended attributes can be read independently of the main file
* data. Taking i_mutex even when reading would cause contention
* between readers of EAs and writers of regular file data, so
* instead we synchronize on xattr_sem when reading or changing
* EAs.
*/
struct rw_semaphore xattr_sem;
#endif
#ifdef CONFIG_EXT4_FS_POSIX_ACL
struct posix_acl *i_acl;
struct posix_acl *i_default_acl;
#endif
struct list_head i_orphan; /* unlinked but open inodes */
/*
* i_disksize keeps track of what the inode size is ON DISK, not
* in memory. During truncate, i_size is set to the new size by
* the VFS prior to calling ext4_truncate(), but the filesystem won't
* set i_disksize to 0 until the truncate is actually under way.
*
* The intent is that i_disksize always represents the blocks which
* are used by this file. This allows recovery to restart truncate
* on orphans if we crash during truncate. We actually write i_disksize
* into the on-disk inode when writing inodes out, instead of i_size.
*
* The only time when i_disksize and i_size may be different is when
* a truncate is in progress. The only things which change i_disksize
* are ext4_get_block (growth) and ext4_truncate (shrinkth).
*/
loff_t i_disksize;
/*
* i_data_sem is for serialising ext4_truncate() against
* ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
* data tree are chopped off during truncate. We can't do that in
* ext4 because whenever we perform intermediate commits during
* truncate, the inode and all the metadata blocks *must* be in a
* consistent state which allows truncation of the orphans to restart
* during recovery. Hence we must fix the get_block-vs-truncate race
* by other means, so we have i_data_sem.
*/
struct rw_semaphore i_data_sem;
struct inode vfs_inode;
struct jbd2_inode jinode;
struct ext4_ext_cache i_cached_extent;
/*
* File creation time. Its function is same as that of
* struct timespec i_{a,c,m}time in the generic inode.
*/
struct timespec i_crtime;
/* mballoc */
struct list_head i_prealloc_list;
spinlock_t i_prealloc_lock;
/* ialloc */
ext4_group_t i_last_alloc_group;
/* allocation reservation info for delalloc */
unsigned int i_reserved_data_blocks;
unsigned int i_reserved_meta_blocks;
unsigned int i_allocated_meta_blocks;
unsigned short i_delalloc_reserved_flag;
/* on-disk additional length */
__u16 i_extra_isize;
spinlock_t i_block_reservation_lock;
};
#endif /* _EXT4_I */

161
fs/ext4/ext4_sb.h
Просмотреть файл

@ -1,161 +0,0 @@
/*
* ext4_sb.h
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/include/linux/minix_fs_sb.h
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#ifndef _EXT4_SB
#define _EXT4_SB
#ifdef __KERNEL__
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/blockgroup_lock.h>
#include <linux/percpu_counter.h>
#endif
#include <linux/rbtree.h>
/*
* fourth extended-fs super-block data in memory
*/
struct ext4_sb_info {
unsigned long s_desc_size; /* Size of a group descriptor in bytes */
unsigned long s_inodes_per_block;/* Number of inodes per block */
unsigned long s_blocks_per_group;/* Number of blocks in a group */
unsigned long s_inodes_per_group;/* Number of inodes in a group */
unsigned long s_itb_per_group; /* Number of inode table blocks per group */
unsigned long s_gdb_count; /* Number of group descriptor blocks */
unsigned long s_desc_per_block; /* Number of group descriptors per block */
ext4_group_t s_groups_count; /* Number of groups in the fs */
unsigned long s_overhead_last; /* Last calculated overhead */
unsigned long s_blocks_last; /* Last seen block count */
loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
struct buffer_head * s_sbh; /* Buffer containing the super block */
struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
struct buffer_head **s_group_desc;
unsigned long s_mount_opt;
ext4_fsblk_t s_sb_block;
uid_t s_resuid;
gid_t s_resgid;
unsigned short s_mount_state;
unsigned short s_pad;
int s_addr_per_block_bits;
int s_desc_per_block_bits;
int s_inode_size;
int s_first_ino;
unsigned int s_inode_readahead_blks;
spinlock_t s_next_gen_lock;
u32 s_next_generation;
u32 s_hash_seed[4];
int s_def_hash_version;
int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
struct percpu_counter s_freeblocks_counter;
struct percpu_counter s_freeinodes_counter;
struct percpu_counter s_dirs_counter;
struct percpu_counter s_dirtyblocks_counter;
struct blockgroup_lock *s_blockgroup_lock;
struct proc_dir_entry *s_proc;
struct kobject s_kobj;
struct completion s_kobj_unregister;
/* Journaling */
struct inode *s_journal_inode;
struct journal_s *s_journal;
struct list_head s_orphan;
unsigned long s_commit_interval;
u32 s_max_batch_time;
u32 s_min_batch_time;
struct block_device *journal_bdev;
#ifdef CONFIG_JBD2_DEBUG
struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
#endif
#ifdef CONFIG_QUOTA
char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
int s_jquota_fmt; /* Format of quota to use */
#endif
unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
#ifdef EXTENTS_STATS
/* ext4 extents stats */
unsigned long s_ext_min;
unsigned long s_ext_max;
unsigned long s_depth_max;
spinlock_t s_ext_stats_lock;
unsigned long s_ext_blocks;
unsigned long s_ext_extents;
#endif
/* for buddy allocator */
struct ext4_group_info ***s_group_info;
struct inode *s_buddy_cache;
long s_blocks_reserved;
spinlock_t s_reserve_lock;
spinlock_t s_md_lock;
tid_t s_last_transaction;
unsigned short *s_mb_offsets;
unsigned int *s_mb_maxs;
/* tunables */
unsigned long s_stripe;
unsigned int s_mb_stream_request;
unsigned int s_mb_max_to_scan;
unsigned int s_mb_min_to_scan;
unsigned int s_mb_stats;
unsigned int s_mb_order2_reqs;
unsigned int s_mb_group_prealloc;
/* where last allocation was done - for stream allocation */
unsigned long s_mb_last_group;
unsigned long s_mb_last_start;
/* history to debug policy */
struct ext4_mb_history *s_mb_history;
int s_mb_history_cur;
int s_mb_history_max;
int s_mb_history_num;
spinlock_t s_mb_history_lock;
int s_mb_history_filter;
/* stats for buddy allocator */
spinlock_t s_mb_pa_lock;
atomic_t s_bal_reqs; /* number of reqs with len > 1 */
atomic_t s_bal_success; /* we found long enough chunks */
atomic_t s_bal_allocated; /* in blocks */
atomic_t s_bal_ex_scanned; /* total extents scanned */
atomic_t s_bal_goals; /* goal hits */
atomic_t s_bal_breaks; /* too long searches */
atomic_t s_bal_2orders; /* 2^order hits */
spinlock_t s_bal_lock;
unsigned long s_mb_buddies_generated;
unsigned long long s_mb_generation_time;
atomic_t s_mb_lost_chunks;
atomic_t s_mb_preallocated;
atomic_t s_mb_discarded;
/* locality groups */
struct ext4_locality_group *s_locality_groups;
/* for write statistics */
unsigned long s_sectors_written_start;
u64 s_kbytes_written;
unsigned int s_log_groups_per_flex;
struct flex_groups *s_flex_groups;
};
static inline spinlock_t *
sb_bgl_lock(struct ext4_sb_info *sbi, unsigned int block_group)
{
return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
}
#endif /* _EXT4_SB */

85
fs/ext4/extents.c
Просмотреть файл

@ -326,32 +326,18 @@ ext4_ext_max_entries(struct inode *inode, int depth)
static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
{
ext4_fsblk_t block = ext_pblock(ext), valid_block;
ext4_fsblk_t block = ext_pblock(ext);
int len = ext4_ext_get_actual_len(ext);
struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
valid_block = le32_to_cpu(es->s_first_data_block) +
EXT4_SB(inode->i_sb)->s_gdb_count;
if (unlikely(block <= valid_block ||
((block + len) > ext4_blocks_count(es))))
return 0;
else
return 1;
return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
}
static int ext4_valid_extent_idx(struct inode *inode,
struct ext4_extent_idx *ext_idx)
{
ext4_fsblk_t block = idx_pblock(ext_idx), valid_block;
struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
ext4_fsblk_t block = idx_pblock(ext_idx);
valid_block = le32_to_cpu(es->s_first_data_block) +
EXT4_SB(inode->i_sb)->s_gdb_count;
if (unlikely(block <= valid_block ||
(block >= ext4_blocks_count(es))))
return 0;
else
return 1;
return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, 1);
}
static int ext4_valid_extent_entries(struct inode *inode,
@ -2097,12 +2083,16 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
ex = EXT_LAST_EXTENT(eh);
ex_ee_block = le32_to_cpu(ex->ee_block);
if (ext4_ext_is_uninitialized(ex))
uninitialized = 1;
ex_ee_len = ext4_ext_get_actual_len(ex);
while (ex >= EXT_FIRST_EXTENT(eh) &&
ex_ee_block + ex_ee_len > start) {
if (ext4_ext_is_uninitialized(ex))
uninitialized = 1;
else
uninitialized = 0;
ext_debug("remove ext %lu:%u\n", ex_ee_block, ex_ee_len);
path[depth].p_ext = ex;
@ -2784,7 +2774,7 @@ fix_extent_len:
int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock,
unsigned int max_blocks, struct buffer_head *bh_result,
int create, int extend_disksize)
int flags)
{
struct ext4_ext_path *path = NULL;
struct ext4_extent_header *eh;
@ -2793,7 +2783,6 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
int err = 0, depth, ret, cache_type;
unsigned int allocated = 0;
struct ext4_allocation_request ar;
loff_t disksize;
__clear_bit(BH_New, &bh_result->b_state);
ext_debug("blocks %u/%u requested for inode %u\n",
@ -2803,7 +2792,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
cache_type = ext4_ext_in_cache(inode, iblock, &newex);
if (cache_type) {
if (cache_type == EXT4_EXT_CACHE_GAP) {
if (!create) {
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
/*
* block isn't allocated yet and
* user doesn't want to allocate it
@ -2869,9 +2858,11 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
EXT4_EXT_CACHE_EXTENT);
goto out;
}
if (create == EXT4_CREATE_UNINITIALIZED_EXT)
if (flags & EXT4_GET_BLOCKS_UNINIT_EXT)
goto out;
if (!create) {
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
if (allocated > max_blocks)
allocated = max_blocks;
/*
* We have blocks reserved already. We
* return allocated blocks so that delalloc
@ -2879,8 +2870,6 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
* the buffer head will be unmapped so that
* a read from the block returns 0s.
*/
if (allocated > max_blocks)
allocated = max_blocks;
set_buffer_unwritten(bh_result);
bh_result->b_bdev = inode->i_sb->s_bdev;
bh_result->b_blocknr = newblock;
@ -2903,7 +2892,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
* requested block isn't allocated yet;
* we couldn't try to create block if create flag is zero
*/
if (!create) {
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
/*
* put just found gap into cache to speed up
* subsequent requests
@ -2932,10 +2921,10 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
* EXT_UNINIT_MAX_LEN.
*/
if (max_blocks > EXT_INIT_MAX_LEN &&
create != EXT4_CREATE_UNINITIALIZED_EXT)
!(flags & EXT4_GET_BLOCKS_UNINIT_EXT))
max_blocks = EXT_INIT_MAX_LEN;
else if (max_blocks > EXT_UNINIT_MAX_LEN &&
create == EXT4_CREATE_UNINITIALIZED_EXT)
(flags & EXT4_GET_BLOCKS_UNINIT_EXT))
max_blocks = EXT_UNINIT_MAX_LEN;
/* Check if we can really insert (iblock)::(iblock+max_blocks) extent */
@ -2966,7 +2955,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
/* try to insert new extent into found leaf and return */
ext4_ext_store_pblock(&newex, newblock);
newex.ee_len = cpu_to_le16(ar.len);
if (create == EXT4_CREATE_UNINITIALIZED_EXT) /* Mark uninitialized */
if (flags & EXT4_GET_BLOCKS_UNINIT_EXT) /* Mark uninitialized */
ext4_ext_mark_uninitialized(&newex);
err = ext4_ext_insert_extent(handle, inode, path, &newex);
if (err) {
@ -2983,18 +2972,10 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
newblock = ext_pblock(&newex);
allocated = ext4_ext_get_actual_len(&newex);
outnew:
if (extend_disksize) {
disksize = ((loff_t) iblock + ar.len) << inode->i_blkbits;
if (disksize > i_size_read(inode))
disksize = i_size_read(inode);
if (disksize > EXT4_I(inode)->i_disksize)
EXT4_I(inode)->i_disksize = disksize;
}
set_buffer_new(bh_result);
/* Cache only when it is _not_ an uninitialized extent */
if (create != EXT4_CREATE_UNINITIALIZED_EXT)
if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0)
ext4_ext_put_in_cache(inode, iblock, allocated, newblock,
EXT4_EXT_CACHE_EXTENT);
out:
@ -3150,9 +3131,10 @@ retry:
ret = PTR_ERR(handle);
break;
}
ret = ext4_get_blocks_wrap(handle, inode, block,
max_blocks, &map_bh,
EXT4_CREATE_UNINITIALIZED_EXT, 0, 0);
map_bh.b_state = 0;
ret = ext4_get_blocks(handle, inode, block,
max_blocks, &map_bh,
EXT4_GET_BLOCKS_CREATE_UNINIT_EXT);
if (ret <= 0) {
#ifdef EXT4FS_DEBUG
WARN_ON(ret <= 0);
@ -3195,7 +3177,7 @@ static int ext4_ext_fiemap_cb(struct inode *inode, struct ext4_ext_path *path,
void *data)
{
struct fiemap_extent_info *fieinfo = data;
unsigned long blksize_bits = inode->i_sb->s_blocksize_bits;
unsigned char blksize_bits = inode->i_sb->s_blocksize_bits;
__u64 logical;
__u64 physical;
__u64 length;
@ -3242,9 +3224,16 @@ static int ext4_ext_fiemap_cb(struct inode *inode, struct ext4_ext_path *path,
*
* XXX this might miss a single-block extent at EXT_MAX_BLOCK
*/
if (logical + length - 1 == EXT_MAX_BLOCK ||
ext4_ext_next_allocated_block(path) == EXT_MAX_BLOCK)
if (ext4_ext_next_allocated_block(path) == EXT_MAX_BLOCK ||
newex->ec_block + newex->ec_len - 1 == EXT_MAX_BLOCK) {
loff_t size = i_size_read(inode);
loff_t bs = EXT4_BLOCK_SIZE(inode->i_sb);
flags |= FIEMAP_EXTENT_LAST;
if ((flags & FIEMAP_EXTENT_DELALLOC) &&
logical+length > size)
length = (size - logical + bs - 1) & ~(bs-1);
}
error = fiemap_fill_next_extent(fieinfo, logical, physical,
length, flags);
@ -3318,10 +3307,10 @@ int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
* Walk the extent tree gathering extent information.
* ext4_ext_fiemap_cb will push extents back to user.
*/
down_write(&EXT4_I(inode)->i_data_sem);
down_read(&EXT4_I(inode)->i_data_sem);
error = ext4_ext_walk_space(inode, start_blk, len_blks,
ext4_ext_fiemap_cb, fieinfo);
up_write(&EXT4_I(inode)->i_data_sem);
up_read(&EXT4_I(inode)->i_data_sem);
}
return error;

29
fs/ext4/group.h
Просмотреть файл

@ -1,29 +0,0 @@
/*
* linux/fs/ext4/group.h
*
* Copyright (C) 2007 Cluster File Systems, Inc
*
* Author: Andreas Dilger <adilger@clusterfs.com>
*/
#ifndef _LINUX_EXT4_GROUP_H
#define _LINUX_EXT4_GROUP_H
extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
struct ext4_group_desc *gdp);
extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
struct ext4_group_desc *gdp);
struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
ext4_group_t block_group);
extern unsigned ext4_init_block_bitmap(struct super_block *sb,
struct buffer_head *bh,
ext4_group_t group,
struct ext4_group_desc *desc);
#define ext4_free_blocks_after_init(sb, group, desc) \
ext4_init_block_bitmap(sb, NULL, group, desc)
extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
struct buffer_head *bh,
ext4_group_t group,
struct ext4_group_desc *desc);
extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
#endif /* _LINUX_EXT4_GROUP_H */

73
fs/ext4/ialloc.c
Просмотреть файл

@ -27,7 +27,6 @@
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"
#include "group.h"
/*
* ialloc.c contains the inodes allocation and deallocation routines
@ -123,16 +122,16 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
unlock_buffer(bh);
return bh;
}
spin_lock(sb_bgl_lock(EXT4_SB(sb), block_group));
ext4_lock_group(sb, block_group);
if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
ext4_init_inode_bitmap(sb, bh, block_group, desc);
set_bitmap_uptodate(bh);
set_buffer_uptodate(bh);
spin_unlock(sb_bgl_lock(EXT4_SB(sb), block_group));
ext4_unlock_group(sb, block_group);
unlock_buffer(bh);
return bh;
}
spin_unlock(sb_bgl_lock(EXT4_SB(sb), block_group));
ext4_unlock_group(sb, block_group);
if (buffer_uptodate(bh)) {
/*
* if not uninit if bh is uptodate,
@ -247,9 +246,8 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
goto error_return;
/* Ok, now we can actually update the inode bitmaps.. */
spin_lock(sb_bgl_lock(sbi, block_group));
cleared = ext4_clear_bit(bit, bitmap_bh->b_data);
spin_unlock(sb_bgl_lock(sbi, block_group));
cleared = ext4_clear_bit_atomic(ext4_group_lock_ptr(sb, block_group),
bit, bitmap_bh->b_data);
if (!cleared)
ext4_error(sb, "ext4_free_inode",
"bit already cleared for inode %lu", ino);
@ -261,7 +259,7 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
if (fatal) goto error_return;
if (gdp) {
spin_lock(sb_bgl_lock(sbi, block_group));
ext4_lock_group(sb, block_group);
count = ext4_free_inodes_count(sb, gdp) + 1;
ext4_free_inodes_set(sb, gdp, count);
if (is_directory) {
@ -277,7 +275,7 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
}
gdp->bg_checksum = ext4_group_desc_csum(sbi,
block_group, gdp);
spin_unlock(sb_bgl_lock(sbi, block_group));
ext4_unlock_group(sb, block_group);
percpu_counter_inc(&sbi->s_freeinodes_counter);
if (is_directory)
percpu_counter_dec(&sbi->s_dirs_counter);
@ -316,7 +314,7 @@ error_return:
static int find_group_dir(struct super_block *sb, struct inode *parent,
ext4_group_t *best_group)
{
ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
ext4_group_t ngroups = ext4_get_groups_count(sb);
unsigned int freei, avefreei;
struct ext4_group_desc *desc, *best_desc = NULL;
ext4_group_t group;
@ -349,11 +347,10 @@ static int find_group_flex(struct super_block *sb, struct inode *parent,
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_group_desc *desc;
struct buffer_head *bh;
struct flex_groups *flex_group = sbi->s_flex_groups;
ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
ext4_group_t parent_fbg_group = ext4_flex_group(sbi, parent_group);
ext4_group_t ngroups = sbi->s_groups_count;
ext4_group_t ngroups = ext4_get_groups_count(sb);
int flex_size = ext4_flex_bg_size(sbi);
ext4_group_t best_flex = parent_fbg_group;
int blocks_per_flex = sbi->s_blocks_per_group * flex_size;
@ -362,7 +359,7 @@ static int find_group_flex(struct super_block *sb, struct inode *parent,
ext4_group_t n_fbg_groups;
ext4_group_t i;
n_fbg_groups = (sbi->s_groups_count + flex_size - 1) >>
n_fbg_groups = (ngroups + flex_size - 1) >>
sbi->s_log_groups_per_flex;
find_close_to_parent:
@ -404,7 +401,7 @@ find_close_to_parent:
found_flexbg:
for (i = best_flex * flex_size; i < ngroups &&
i < (best_flex + 1) * flex_size; i++) {
desc = ext4_get_group_desc(sb, i, &bh);
desc = ext4_get_group_desc(sb, i, NULL);
if (ext4_free_inodes_count(sb, desc)) {
*best_group = i;
goto out;
@ -478,20 +475,21 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
{
ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
struct ext4_sb_info *sbi = EXT4_SB(sb);
ext4_group_t ngroups = sbi->s_groups_count;
ext4_group_t real_ngroups = ext4_get_groups_count(sb);
int inodes_per_group = EXT4_INODES_PER_GROUP(sb);
unsigned int freei, avefreei;
ext4_fsblk_t freeb, avefreeb;
unsigned int ndirs;
int max_dirs, min_inodes;
ext4_grpblk_t min_blocks;
ext4_group_t i, grp, g;
ext4_group_t i, grp, g, ngroups;
struct ext4_group_desc *desc;
struct orlov_stats stats;
int flex_size = ext4_flex_bg_size(sbi);
ngroups = real_ngroups;
if (flex_size > 1) {
ngroups = (ngroups + flex_size - 1) >>
ngroups = (real_ngroups + flex_size - 1) >>
sbi->s_log_groups_per_flex;
parent_group >>= sbi->s_log_groups_per_flex;
}
@ -543,7 +541,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
*/
grp *= flex_size;
for (i = 0; i < flex_size; i++) {
if (grp+i >= sbi->s_groups_count)
if (grp+i >= real_ngroups)
break;
desc = ext4_get_group_desc(sb, grp+i, NULL);
if (desc && ext4_free_inodes_count(sb, desc)) {
@ -583,7 +581,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
}
fallback:
ngroups = sbi->s_groups_count;
ngroups = real_ngroups;
avefreei = freei / ngroups;
fallback_retry:
parent_group = EXT4_I(parent)->i_block_group;
@ -613,9 +611,8 @@ static int find_group_other(struct super_block *sb, struct inode *parent,
ext4_group_t *group, int mode)
{
ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
ext4_group_t i, last, ngroups = ext4_get_groups_count(sb);
struct ext4_group_desc *desc;
ext4_group_t i, last;
int flex_size = ext4_flex_bg_size(EXT4_SB(sb));
/*
@ -708,10 +705,10 @@ static int find_group_other(struct super_block *sb, struct inode *parent,
/*
* claim the inode from the inode bitmap. If the group
* is uninit we need to take the groups's sb_bgl_lock
* is uninit we need to take the groups's ext4_group_lock
* and clear the uninit flag. The inode bitmap update
* and group desc uninit flag clear should be done
* after holding sb_bgl_lock so that ext4_read_inode_bitmap
* after holding ext4_group_lock so that ext4_read_inode_bitmap
* doesn't race with the ext4_claim_inode
*/
static int ext4_claim_inode(struct super_block *sb,
@ -722,7 +719,7 @@ static int ext4_claim_inode(struct super_block *sb,
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
spin_lock(sb_bgl_lock(sbi, group));
ext4_lock_group(sb, group);
if (ext4_set_bit(ino, inode_bitmap_bh->b_data)) {
/* not a free inode */
retval = 1;
@ -731,7 +728,7 @@ static int ext4_claim_inode(struct super_block *sb,
ino++;
if ((group == 0 && ino < EXT4_FIRST_INO(sb)) ||
ino > EXT4_INODES_PER_GROUP(sb)) {
spin_unlock(sb_bgl_lock(sbi, group));
ext4_unlock_group(sb, group);
ext4_error(sb, __func__,
"reserved inode or inode > inodes count - "
"block_group = %u, inode=%lu", group,
@ -780,7 +777,7 @@ static int ext4_claim_inode(struct super_block *sb,
}
gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp);
err_ret:
spin_unlock(sb_bgl_lock(sbi, group));
ext4_unlock_group(sb, group);
return retval;
}
@ -799,11 +796,10 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, int mode)
struct super_block *sb;
struct buffer_head *inode_bitmap_bh = NULL;
struct buffer_head *group_desc_bh;
ext4_group_t group = 0;
ext4_group_t ngroups, group = 0;
unsigned long ino = 0;
struct inode *inode;
struct ext4_group_desc *gdp = NULL;
struct ext4_super_block *es;
struct ext4_inode_info *ei;
struct ext4_sb_info *sbi;
int ret2, err = 0;
@ -818,15 +814,14 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, int mode)
return ERR_PTR(-EPERM);
sb = dir->i_sb;
ngroups = ext4_get_groups_count(sb);
trace_mark(ext4_request_inode, "dev %s dir %lu mode %d", sb->s_id,
dir->i_ino, mode);
inode = new_inode(sb);
if (!inode)
return ERR_PTR(-ENOMEM);
ei = EXT4_I(inode);
sbi = EXT4_SB(sb);
es = sbi->s_es;
if (sbi->s_log_groups_per_flex && test_opt(sb, OLDALLOC)) {
ret2 = find_group_flex(sb, dir, &group);
@ -856,7 +851,7 @@ got_group:
if (ret2 == -1)
goto out;
for (i = 0; i < sbi->s_groups_count; i++) {
for (i = 0; i < ngroups; i++) {
err = -EIO;
gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
@ -917,7 +912,7 @@ repeat_in_this_group:
* group descriptor metadata has not yet been updated.
* So we just go onto the next blockgroup.
*/
if (++group == sbi->s_groups_count)
if (++group == ngroups)
group = 0;
}
err = -ENOSPC;
@ -938,7 +933,7 @@ got:
}
free = 0;
spin_lock(sb_bgl_lock(sbi, group));
ext4_lock_group(sb, group);
/* recheck and clear flag under lock if we still need to */
if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
free = ext4_free_blocks_after_init(sb, group, gdp);
@ -947,7 +942,7 @@ got:
gdp->bg_checksum = ext4_group_desc_csum(sbi, group,
gdp);
}
spin_unlock(sb_bgl_lock(sbi, group));
ext4_unlock_group(sb, group);
/* Don't need to dirty bitmap block if we didn't change it */
if (free) {
@ -1158,7 +1153,7 @@ unsigned long ext4_count_free_inodes(struct super_block *sb)
{
unsigned long desc_count;
struct ext4_group_desc *gdp;
ext4_group_t i;
ext4_group_t i, ngroups = ext4_get_groups_count(sb);
#ifdef EXT4FS_DEBUG
struct ext4_super_block *es;
unsigned long bitmap_count, x;
@ -1168,7 +1163,7 @@ unsigned long ext4_count_free_inodes(struct super_block *sb)
desc_count = 0;
bitmap_count = 0;
gdp = NULL;
for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
for (i = 0; i < ngroups; i++) {
gdp = ext4_get_group_desc(sb, i, NULL);
if (!gdp)
continue;
@ -1190,7 +1185,7 @@ unsigned long ext4_count_free_inodes(struct super_block *sb)
return desc_count;
#else
desc_count = 0;
for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
for (i = 0; i < ngroups; i++) {
gdp = ext4_get_group_desc(sb, i, NULL);
if (!gdp)
continue;
@ -1205,9 +1200,9 @@ unsigned long ext4_count_free_inodes(struct super_block *sb)
unsigned long ext4_count_dirs(struct super_block * sb)
{
unsigned long count = 0;
ext4_group_t i;
ext4_group_t i, ngroups = ext4_get_groups_count(sb);
for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
for (i = 0; i < ngroups; i++) {
struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
if (!gdp)
continue;

599
fs/ext4/inode.c
Просмотреть файл

@ -372,20 +372,21 @@ static int ext4_block_to_path(struct inode *inode,
}
static int __ext4_check_blockref(const char *function, struct inode *inode,
__le32 *p, unsigned int max) {
unsigned int maxblocks = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es);
__le32 *p, unsigned int max)
{
__le32 *bref = p;
unsigned int blk;
while (bref < p+max) {
if (unlikely(le32_to_cpu(*bref) >= maxblocks)) {
blk = le32_to_cpu(*bref++);
if (blk &&
unlikely(!ext4_data_block_valid(EXT4_SB(inode->i_sb),
blk, 1))) {
ext4_error(inode->i_sb, function,
"block reference %u >= max (%u) "
"in inode #%lu, offset=%d",
le32_to_cpu(*bref), maxblocks,
inode->i_ino, (int)(bref-p));
"invalid block reference %u "
"in inode #%lu", blk, inode->i_ino);
return -EIO;
}
bref++;
}
return 0;
}
@ -892,6 +893,10 @@ err_out:
}
/*
* The ext4_ind_get_blocks() function handles non-extents inodes
* (i.e., using the traditional indirect/double-indirect i_blocks
* scheme) for ext4_get_blocks().
*
* Allocation strategy is simple: if we have to allocate something, we will
* have to go the whole way to leaf. So let's do it before attaching anything
* to tree, set linkage between the newborn blocks, write them if sync is
@ -909,15 +914,16 @@ err_out:
* return = 0, if plain lookup failed.
* return < 0, error case.
*
*
* Need to be called with
* down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block
* (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem)
* The ext4_ind_get_blocks() function should be called with
* down_write(&EXT4_I(inode)->i_data_sem) if allocating filesystem
* blocks (i.e., flags has EXT4_GET_BLOCKS_CREATE set) or
* down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system
* blocks.
*/
static int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
static int ext4_ind_get_blocks(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock, unsigned int maxblocks,
struct buffer_head *bh_result,
int create, int extend_disksize)
int flags)
{
int err = -EIO;
ext4_lblk_t offsets[4];
@ -927,14 +933,11 @@ static int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
int indirect_blks;
int blocks_to_boundary = 0;
int depth;
struct ext4_inode_info *ei = EXT4_I(inode);
int count = 0;
ext4_fsblk_t first_block = 0;
loff_t disksize;
J_ASSERT(!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL));
J_ASSERT(handle != NULL || create == 0);
J_ASSERT(handle != NULL || (flags & EXT4_GET_BLOCKS_CREATE) == 0);
depth = ext4_block_to_path(inode, iblock, offsets,
&blocks_to_boundary);
@ -963,7 +966,7 @@ static int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
}
/* Next simple case - plain lookup or failed read of indirect block */
if (!create || err == -EIO)
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0 || err == -EIO)
goto cleanup;
/*
@ -997,19 +1000,7 @@ static int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
if (!err)
err = ext4_splice_branch(handle, inode, iblock,
partial, indirect_blks, count);
/*
* i_disksize growing is protected by i_data_sem. Don't forget to
* protect it if you're about to implement concurrent
* ext4_get_block() -bzzz
*/
if (!err && extend_disksize) {
disksize = ((loff_t) iblock + count) << inode->i_blkbits;
if (disksize > i_size_read(inode))
disksize = i_size_read(inode);
if (disksize > ei->i_disksize)
ei->i_disksize = disksize;
}
if (err)
else
goto cleanup;
set_buffer_new(bh_result);
@ -1120,8 +1111,23 @@ static void ext4_da_update_reserve_space(struct inode *inode, int used)
ext4_discard_preallocations(inode);
}
static int check_block_validity(struct inode *inode, sector_t logical,
sector_t phys, int len)
{
if (!ext4_data_block_valid(EXT4_SB(inode->i_sb), phys, len)) {
ext4_error(inode->i_sb, "check_block_validity",
"inode #%lu logical block %llu mapped to %llu "
"(size %d)", inode->i_ino,
(unsigned long long) logical,
(unsigned long long) phys, len);
WARN_ON(1);
return -EIO;
}
return 0;
}
/*
* The ext4_get_blocks_wrap() function try to look up the requested blocks,
* The ext4_get_blocks() function tries to look up the requested blocks,
* and returns if the blocks are already mapped.
*
* Otherwise it takes the write lock of the i_data_sem and allocate blocks
@ -1129,7 +1135,7 @@ static void ext4_da_update_reserve_space(struct inode *inode, int used)
* mapped.
*
* If file type is extents based, it will call ext4_ext_get_blocks(),
* Otherwise, call with ext4_get_blocks_handle() to handle indirect mapping
* Otherwise, call with ext4_ind_get_blocks() to handle indirect mapping
* based files
*
* On success, it returns the number of blocks being mapped or allocate.
@ -1142,9 +1148,9 @@ static void ext4_da_update_reserve_space(struct inode *inode, int used)
*
* It returns the error in case of allocation failure.
*/
int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
unsigned int max_blocks, struct buffer_head *bh,
int create, int extend_disksize, int flag)
int ext4_get_blocks(handle_t *handle, struct inode *inode, sector_t block,
unsigned int max_blocks, struct buffer_head *bh,
int flags)
{
int retval;
@ -1152,21 +1158,28 @@ int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
clear_buffer_unwritten(bh);
/*
* Try to see if we can get the block without requesting
* for new file system block.
* Try to see if we can get the block without requesting a new
* file system block.
*/
down_read((&EXT4_I(inode)->i_data_sem));
if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
retval = ext4_ext_get_blocks(handle, inode, block, max_blocks,
bh, 0, 0);
bh, 0);
} else {
retval = ext4_get_blocks_handle(handle,
inode, block, max_blocks, bh, 0, 0);
retval = ext4_ind_get_blocks(handle, inode, block, max_blocks,
bh, 0);
}
up_read((&EXT4_I(inode)->i_data_sem));
if (retval > 0 && buffer_mapped(bh)) {
int ret = check_block_validity(inode, block,
bh->b_blocknr, retval);
if (ret != 0)
return ret;
}
/* If it is only a block(s) look up */
if (!create)
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0)
return retval;
/*
@ -1205,7 +1218,7 @@ int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
* let the underlying get_block() function know to
* avoid double accounting
*/
if (flag)
if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
EXT4_I(inode)->i_delalloc_reserved_flag = 1;
/*
* We need to check for EXT4 here because migrate
@ -1213,10 +1226,10 @@ int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
*/
if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
retval = ext4_ext_get_blocks(handle, inode, block, max_blocks,
bh, create, extend_disksize);
bh, flags);
} else {
retval = ext4_get_blocks_handle(handle, inode, block,
max_blocks, bh, create, extend_disksize);
retval = ext4_ind_get_blocks(handle, inode, block,
max_blocks, bh, flags);
if (retval > 0 && buffer_new(bh)) {
/*
@ -1229,18 +1242,23 @@ int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
}
}
if (flag) {
if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
EXT4_I(inode)->i_delalloc_reserved_flag = 0;
/*
* Update reserved blocks/metadata blocks
* after successful block allocation
* which were deferred till now
*/
if ((retval > 0) && buffer_delay(bh))
ext4_da_update_reserve_space(inode, retval);
}
/*
* Update reserved blocks/metadata blocks after successful
* block allocation which had been deferred till now.
*/
if ((retval > 0) && (flags & EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE))
ext4_da_update_reserve_space(inode, retval);
up_write((&EXT4_I(inode)->i_data_sem));
if (retval > 0 && buffer_mapped(bh)) {
int ret = check_block_validity(inode, block,
bh->b_blocknr, retval);
if (ret != 0)
return ret;
}
return retval;
}
@ -1268,8 +1286,8 @@ int ext4_get_block(struct inode *inode, sector_t iblock,
started = 1;
}
ret = ext4_get_blocks_wrap(handle, inode, iblock,
max_blocks, bh_result, create, 0, 0);
ret = ext4_get_blocks(handle, inode, iblock, max_blocks, bh_result,
create ? EXT4_GET_BLOCKS_CREATE : 0);
if (ret > 0) {
bh_result->b_size = (ret << inode->i_blkbits);
ret = 0;
@ -1288,17 +1306,19 @@ struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
{
struct buffer_head dummy;
int fatal = 0, err;
int flags = 0;
J_ASSERT(handle != NULL || create == 0);
dummy.b_state = 0;
dummy.b_blocknr = -1000;
buffer_trace_init(&dummy.b_history);
err = ext4_get_blocks_wrap(handle, inode, block, 1,
&dummy, create, 1, 0);
if (create)
flags |= EXT4_GET_BLOCKS_CREATE;
err = ext4_get_blocks(handle, inode, block, 1, &dummy, flags);
/*
* ext4_get_blocks_handle() returns number of blocks
* mapped. 0 in case of a HOLE.
* ext4_get_blocks() returns number of blocks mapped. 0 in
* case of a HOLE.
*/
if (err > 0) {
if (err > 1)
@ -1439,7 +1459,7 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping,
struct page **pagep, void **fsdata)
{
struct inode *inode = mapping->host;
int ret, needed_blocks = ext4_writepage_trans_blocks(inode);
int ret, needed_blocks;
handle_t *handle;
int retries = 0;
struct page *page;
@ -1450,6 +1470,11 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping,
"dev %s ino %lu pos %llu len %u flags %u",
inode->i_sb->s_id, inode->i_ino,
(unsigned long long) pos, len, flags);
/*
* Reserve one block more for addition to orphan list in case
* we allocate blocks but write fails for some reason
*/
needed_blocks = ext4_writepage_trans_blocks(inode) + 1;
index = pos >> PAGE_CACHE_SHIFT;
from = pos & (PAGE_CACHE_SIZE - 1);
to = from + len;
@ -1483,15 +1508,30 @@ retry:
if (ret) {
unlock_page(page);
ext4_journal_stop(handle);
page_cache_release(page);
/*
* block_write_begin may have instantiated a few blocks
* outside i_size. Trim these off again. Don't need
* i_size_read because we hold i_mutex.
*
* Add inode to orphan list in case we crash before
* truncate finishes
*/
if (pos + len > inode->i_size)
ext4_orphan_add(handle, inode);
ext4_journal_stop(handle);
if (pos + len > inode->i_size) {
vmtruncate(inode, inode->i_size);
/*
* If vmtruncate failed early the inode might
* still be on the orphan list; we need to
* make sure the inode is removed from the
* orphan list in that case.
*/
if (inode->i_nlink)
ext4_orphan_del(NULL, inode);
}
}
if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
@ -1509,6 +1549,52 @@ static int write_end_fn(handle_t *handle, struct buffer_head *bh)
return ext4_handle_dirty_metadata(handle, NULL, bh);
}
static int ext4_generic_write_end(struct file *file,
struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
int i_size_changed = 0;
struct inode *inode = mapping->host;
handle_t *handle = ext4_journal_current_handle();
copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
/*
* No need to use i_size_read() here, the i_size
* cannot change under us because we hold i_mutex.
*
* But it's important to update i_size while still holding page lock:
* page writeout could otherwise come in and zero beyond i_size.
*/
if (pos + copied > inode->i_size) {
i_size_write(inode, pos + copied);
i_size_changed = 1;
}
if (pos + copied > EXT4_I(inode)->i_disksize) {
/* We need to mark inode dirty even if
* new_i_size is less that inode->i_size
* bu greater than i_disksize.(hint delalloc)
*/
ext4_update_i_disksize(inode, (pos + copied));
i_size_changed = 1;
}
unlock_page(page);
page_cache_release(page);
/*
* Don't mark the inode dirty under page lock. First, it unnecessarily
* makes the holding time of page lock longer. Second, it forces lock
* ordering of page lock and transaction start for journaling
* filesystems.
*/
if (i_size_changed)
ext4_mark_inode_dirty(handle, inode);
return copied;
}
/*
* We need to pick up the new inode size which generic_commit_write gave us
* `file' can be NULL - eg, when called from page_symlink().
@ -1532,21 +1618,15 @@ static int ext4_ordered_write_end(struct file *file,
ret = ext4_jbd2_file_inode(handle, inode);
if (ret == 0) {
loff_t new_i_size;
new_i_size = pos + copied;
if (new_i_size > EXT4_I(inode)->i_disksize) {
ext4_update_i_disksize(inode, new_i_size);
/* We need to mark inode dirty even if
* new_i_size is less that inode->i_size
* bu greater than i_disksize.(hint delalloc)
*/
ext4_mark_inode_dirty(handle, inode);
}
ret2 = generic_write_end(file, mapping, pos, len, copied,
ret2 = ext4_generic_write_end(file, mapping, pos, len, copied,
page, fsdata);
copied = ret2;
if (pos + len > inode->i_size)
/* if we have allocated more blocks and copied
* less. We will have blocks allocated outside
* inode->i_size. So truncate them
*/
ext4_orphan_add(handle, inode);
if (ret2 < 0)
ret = ret2;
}
@ -1554,6 +1634,18 @@ static int ext4_ordered_write_end(struct file *file,
if (!ret)
ret = ret2;
if (pos + len > inode->i_size) {
vmtruncate(inode, inode->i_size);
/*
* If vmtruncate failed early the inode might still be
* on the orphan list; we need to make sure the inode
* is removed from the orphan list in that case.
*/
if (inode->i_nlink)
ext4_orphan_del(NULL, inode);
}
return ret ? ret : copied;
}
@ -1565,25 +1657,21 @@ static int ext4_writeback_write_end(struct file *file,
handle_t *handle = ext4_journal_current_handle();
struct inode *inode = mapping->host;
int ret = 0, ret2;
loff_t new_i_size;
trace_mark(ext4_writeback_write_end,
"dev %s ino %lu pos %llu len %u copied %u",
inode->i_sb->s_id, inode->i_ino,
(unsigned long long) pos, len, copied);
new_i_size = pos + copied;
if (new_i_size > EXT4_I(inode)->i_disksize) {
ext4_update_i_disksize(inode, new_i_size);
/* We need to mark inode dirty even if
* new_i_size is less that inode->i_size
* bu greater than i_disksize.(hint delalloc)
*/
ext4_mark_inode_dirty(handle, inode);
}
ret2 = generic_write_end(file, mapping, pos, len, copied,
ret2 = ext4_generic_write_end(file, mapping, pos, len, copied,
page, fsdata);
copied = ret2;
if (pos + len > inode->i_size)
/* if we have allocated more blocks and copied
* less. We will have blocks allocated outside
* inode->i_size. So truncate them
*/
ext4_orphan_add(handle, inode);
if (ret2 < 0)
ret = ret2;
@ -1591,6 +1679,17 @@ static int ext4_writeback_write_end(struct file *file,
if (!ret)
ret = ret2;
if (pos + len > inode->i_size) {
vmtruncate(inode, inode->i_size);
/*
* If vmtruncate failed early the inode might still be
* on the orphan list; we need to make sure the inode
* is removed from the orphan list in that case.
*/
if (inode->i_nlink)
ext4_orphan_del(NULL, inode);
}
return ret ? ret : copied;
}
@ -1635,10 +1734,27 @@ static int ext4_journalled_write_end(struct file *file,
}
unlock_page(page);
page_cache_release(page);
if (pos + len > inode->i_size)
/* if we have allocated more blocks and copied
* less. We will have blocks allocated outside
* inode->i_size. So truncate them
*/
ext4_orphan_add(handle, inode);
ret2 = ext4_journal_stop(handle);
if (!ret)
ret = ret2;
page_cache_release(page);
if (pos + len > inode->i_size) {
vmtruncate(inode, inode->i_size);
/*
* If vmtruncate failed early the inode might still be
* on the orphan list; we need to make sure the inode
* is removed from the orphan list in that case.
*/
if (inode->i_nlink)
ext4_orphan_del(NULL, inode);
}
return ret ? ret : copied;
}
@ -1852,7 +1968,7 @@ static int mpage_da_submit_io(struct mpage_da_data *mpd)
* @logical - first logical block to start assignment with
*
* the function goes through all passed space and put actual disk
* block numbers into buffer heads, dropping BH_Delay
* block numbers into buffer heads, dropping BH_Delay and BH_Unwritten
*/
static void mpage_put_bnr_to_bhs(struct mpage_da_data *mpd, sector_t logical,
struct buffer_head *exbh)
@ -1902,16 +2018,24 @@ static void mpage_put_bnr_to_bhs(struct mpage_da_data *mpd, sector_t logical,
do {
if (cur_logical >= logical + blocks)
break;
if (buffer_delay(bh)) {
bh->b_blocknr = pblock;
clear_buffer_delay(bh);
bh->b_bdev = inode->i_sb->s_bdev;
} else if (buffer_unwritten(bh)) {
bh->b_blocknr = pblock;
clear_buffer_unwritten(bh);
set_buffer_mapped(bh);
set_buffer_new(bh);
bh->b_bdev = inode->i_sb->s_bdev;
if (buffer_delay(bh) ||
buffer_unwritten(bh)) {
BUG_ON(bh->b_bdev != inode->i_sb->s_bdev);
if (buffer_delay(bh)) {
clear_buffer_delay(bh);
bh->b_blocknr = pblock;
} else {
/*
* unwritten already should have
* blocknr assigned. Verify that
*/
clear_buffer_unwritten(bh);
BUG_ON(bh->b_blocknr != pblock);
}
} else if (buffer_mapped(bh))
BUG_ON(bh->b_blocknr != pblock);
@ -1990,51 +2114,6 @@ static void ext4_print_free_blocks(struct inode *inode)
return;
}
#define EXT4_DELALLOC_RSVED 1
static int ext4_da_get_block_write(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
int ret;
unsigned max_blocks = bh_result->b_size >> inode->i_blkbits;
loff_t disksize = EXT4_I(inode)->i_disksize;
handle_t *handle = NULL;
handle = ext4_journal_current_handle();
BUG_ON(!handle);
ret = ext4_get_blocks_wrap(handle, inode, iblock, max_blocks,
bh_result, create, 0, EXT4_DELALLOC_RSVED);
if (ret <= 0)
return ret;
bh_result->b_size = (ret << inode->i_blkbits);
if (ext4_should_order_data(inode)) {
int retval;
retval = ext4_jbd2_file_inode(handle, inode);
if (retval)
/*
* Failed to add inode for ordered mode. Don't
* update file size
*/
return retval;
}
/*
* Update on-disk size along with block allocation we don't
* use 'extend_disksize' as size may change within already
* allocated block -bzzz
*/
disksize = ((loff_t) iblock + ret) << inode->i_blkbits;
if (disksize > i_size_read(inode))
disksize = i_size_read(inode);
if (disksize > EXT4_I(inode)->i_disksize) {
ext4_update_i_disksize(inode, disksize);
ret = ext4_mark_inode_dirty(handle, inode);
return ret;
}
return 0;
}
/*
* mpage_da_map_blocks - go through given space
*
@ -2045,29 +2124,57 @@ static int ext4_da_get_block_write(struct inode *inode, sector_t iblock,
*/
static int mpage_da_map_blocks(struct mpage_da_data *mpd)
{
int err = 0;
int err, blks, get_blocks_flags;
struct buffer_head new;
sector_t next;
sector_t next = mpd->b_blocknr;
unsigned max_blocks = mpd->b_size >> mpd->inode->i_blkbits;
loff_t disksize = EXT4_I(mpd->inode)->i_disksize;
handle_t *handle = NULL;
/*
* We consider only non-mapped and non-allocated blocks
*/
if ((mpd->b_state & (1 << BH_Mapped)) &&
!(mpd->b_state & (1 << BH_Delay)))
return 0;
new.b_state = mpd->b_state;
new.b_blocknr = 0;
new.b_size = mpd->b_size;
next = mpd->b_blocknr;
/*
* If we didn't accumulate anything
* to write simply return
*/
if (!new.b_size)
!(mpd->b_state & (1 << BH_Delay)) &&
!(mpd->b_state & (1 << BH_Unwritten)))
return 0;
err = ext4_da_get_block_write(mpd->inode, next, &new, 1);
if (err) {
/*
* If we didn't accumulate anything to write simply return
*/
if (!mpd->b_size)
return 0;
handle = ext4_journal_current_handle();
BUG_ON(!handle);
/*
* Call ext4_get_blocks() to allocate any delayed allocation
* blocks, or to convert an uninitialized extent to be
* initialized (in the case where we have written into
* one or more preallocated blocks).
*
* We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE to
* indicate that we are on the delayed allocation path. This
* affects functions in many different parts of the allocation
* call path. This flag exists primarily because we don't
* want to change *many* call functions, so ext4_get_blocks()
* will set the magic i_delalloc_reserved_flag once the
* inode's allocation semaphore is taken.
*
* If the blocks in questions were delalloc blocks, set
* EXT4_GET_BLOCKS_DELALLOC_RESERVE so the delalloc accounting
* variables are updated after the blocks have been allocated.
*/
new.b_state = 0;
get_blocks_flags = (EXT4_GET_BLOCKS_CREATE |
EXT4_GET_BLOCKS_DELALLOC_RESERVE);
if (mpd->b_state & (1 << BH_Delay))
get_blocks_flags |= EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE;
blks = ext4_get_blocks(handle, mpd->inode, next, max_blocks,
&new, get_blocks_flags);
if (blks < 0) {
err = blks;
/*
* If get block returns with error we simply
* return. Later writepage will redirty the page and
@ -2100,12 +2207,14 @@ static int mpage_da_map_blocks(struct mpage_da_data *mpd)
if (err == -ENOSPC) {
ext4_print_free_blocks(mpd->inode);
}
/* invlaidate all the pages */
/* invalidate all the pages */
ext4_da_block_invalidatepages(mpd, next,
mpd->b_size >> mpd->inode->i_blkbits);
return err;
}
BUG_ON(new.b_size == 0);
BUG_ON(blks == 0);
new.b_size = (blks << mpd->inode->i_blkbits);
if (buffer_new(&new))
__unmap_underlying_blocks(mpd->inode, &new);
@ -2118,6 +2227,23 @@ static int mpage_da_map_blocks(struct mpage_da_data *mpd)
(mpd->b_state & (1 << BH_Unwritten)))
mpage_put_bnr_to_bhs(mpd, next, &new);
if (ext4_should_order_data(mpd->inode)) {
err = ext4_jbd2_file_inode(handle, mpd->inode);
if (err)
return err;
}
/*
* Update on-disk size along with block allocation.
*/
disksize = ((loff_t) next + blks) << mpd->inode->i_blkbits;
if (disksize > i_size_read(mpd->inode))
disksize = i_size_read(mpd->inode);
if (disksize > EXT4_I(mpd->inode)->i_disksize) {
ext4_update_i_disksize(mpd->inode, disksize);
return ext4_mark_inode_dirty(handle, mpd->inode);
}
return 0;
}
@ -2192,6 +2318,17 @@ flush_it:
return;
}
static int ext4_bh_unmapped_or_delay(handle_t *handle, struct buffer_head *bh)
{
/*
* unmapped buffer is possible for holes.
* delay buffer is possible with delayed allocation.
* We also need to consider unwritten buffer as unmapped.
*/
return (!buffer_mapped(bh) || buffer_delay(bh) ||
buffer_unwritten(bh)) && buffer_dirty(bh);
}
/*
* __mpage_da_writepage - finds extent of pages and blocks
*
@ -2276,8 +2413,7 @@ static int __mpage_da_writepage(struct page *page,
* Otherwise we won't make progress
* with the page in ext4_da_writepage
*/
if (buffer_dirty(bh) &&
(!buffer_mapped(bh) || buffer_delay(bh))) {
if (ext4_bh_unmapped_or_delay(NULL, bh)) {
mpage_add_bh_to_extent(mpd, logical,
bh->b_size,
bh->b_state);
@ -2303,8 +2439,16 @@ static int __mpage_da_writepage(struct page *page,
}
/*
* this is a special callback for ->write_begin() only
* it's intention is to return mapped block or reserve space
* This is a special get_blocks_t callback which is used by
* ext4_da_write_begin(). It will either return mapped block or
* reserve space for a single block.
*
* For delayed buffer_head we have BH_Mapped, BH_New, BH_Delay set.
* We also have b_blocknr = -1 and b_bdev initialized properly
*
* For unwritten buffer_head we have BH_Mapped, BH_New, BH_Unwritten set.
* We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev
* initialized properly.
*/
static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
@ -2323,7 +2467,7 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
* preallocated blocks are unmapped but should treated
* the same as allocated blocks.
*/
ret = ext4_get_blocks_wrap(NULL, inode, iblock, 1, bh_result, 0, 0, 0);
ret = ext4_get_blocks(NULL, inode, iblock, 1, bh_result, 0);
if ((ret == 0) && !buffer_delay(bh_result)) {
/* the block isn't (pre)allocated yet, let's reserve space */
/*
@ -2340,40 +2484,53 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
set_buffer_delay(bh_result);
} else if (ret > 0) {
bh_result->b_size = (ret << inode->i_blkbits);
/*
* With sub-block writes into unwritten extents
* we also need to mark the buffer as new so that
* the unwritten parts of the buffer gets correctly zeroed.
*/
if (buffer_unwritten(bh_result))
if (buffer_unwritten(bh_result)) {
/* A delayed write to unwritten bh should
* be marked new and mapped. Mapped ensures
* that we don't do get_block multiple times
* when we write to the same offset and new
* ensures that we do proper zero out for
* partial write.
*/
set_buffer_new(bh_result);
set_buffer_mapped(bh_result);
}
ret = 0;
}
return ret;
}
static int ext4_bh_unmapped_or_delay(handle_t *handle, struct buffer_head *bh)
{
/*
* unmapped buffer is possible for holes.
* delay buffer is possible with delayed allocation
*/
return ((!buffer_mapped(bh) || buffer_delay(bh)) && buffer_dirty(bh));
}
static int ext4_normal_get_block_write(struct inode *inode, sector_t iblock,
/*
* This function is used as a standard get_block_t calback function
* when there is no desire to allocate any blocks. It is used as a
* callback function for block_prepare_write(), nobh_writepage(), and
* block_write_full_page(). These functions should only try to map a
* single block at a time.
*
* Since this function doesn't do block allocations even if the caller
* requests it by passing in create=1, it is critically important that
* any caller checks to make sure that any buffer heads are returned
* by this function are either all already mapped or marked for
* delayed allocation before calling nobh_writepage() or
* block_write_full_page(). Otherwise, b_blocknr could be left
* unitialized, and the page write functions will be taken by
* surprise.
*/
static int noalloc_get_block_write(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
int ret = 0;
unsigned max_blocks = bh_result->b_size >> inode->i_blkbits;
BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize);
/*
* we don't want to do block allocation in writepage
* so call get_block_wrap with create = 0
*/
ret = ext4_get_blocks_wrap(NULL, inode, iblock, max_blocks,
bh_result, 0, 0, 0);
ret = ext4_get_blocks(NULL, inode, iblock, max_blocks, bh_result, 0);
BUG_ON(create && ret == 0);
if (ret > 0) {
bh_result->b_size = (ret << inode->i_blkbits);
ret = 0;
@ -2382,10 +2539,11 @@ static int ext4_normal_get_block_write(struct inode *inode, sector_t iblock,
}
/*
* get called vi ext4_da_writepages after taking page lock (have journal handle)
* get called via journal_submit_inode_data_buffers (no journal handle)
* get called via shrink_page_list via pdflush (no journal handle)
* or grab_page_cache when doing write_begin (have journal handle)
* This function can get called via...
* - ext4_da_writepages after taking page lock (have journal handle)
* - journal_submit_inode_data_buffers (no journal handle)
* - shrink_page_list via pdflush (no journal handle)
* - grab_page_cache when doing write_begin (have journal handle)
*/
static int ext4_da_writepage(struct page *page,
struct writeback_control *wbc)
@ -2436,7 +2594,7 @@ static int ext4_da_writepage(struct page *page,
* do block allocation here.
*/
ret = block_prepare_write(page, 0, PAGE_CACHE_SIZE,
ext4_normal_get_block_write);
noalloc_get_block_write);
if (!ret) {
page_bufs = page_buffers(page);
/* check whether all are mapped and non delay */
@ -2461,11 +2619,10 @@ static int ext4_da_writepage(struct page *page,
}
if (test_opt(inode->i_sb, NOBH) && ext4_should_writeback_data(inode))
ret = nobh_writepage(page, ext4_normal_get_block_write, wbc);
ret = nobh_writepage(page, noalloc_get_block_write, wbc);
else
ret = block_write_full_page(page,
ext4_normal_get_block_write,
wbc);
ret = block_write_full_page(page, noalloc_get_block_write,
wbc);
return ret;
}
@ -2777,7 +2934,7 @@ retry:
*pagep = page;
ret = block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
ext4_da_get_block_prep);
ext4_da_get_block_prep);
if (ret < 0) {
unlock_page(page);
ext4_journal_stop(handle);
@ -2815,7 +2972,7 @@ static int ext4_da_should_update_i_disksize(struct page *page,
for (i = 0; i < idx; i++)
bh = bh->b_this_page;
if (!buffer_mapped(bh) || (buffer_delay(bh)))
if (!buffer_mapped(bh) || (buffer_delay(bh)) || buffer_unwritten(bh))
return 0;
return 1;
}
@ -3085,12 +3242,10 @@ static int __ext4_normal_writepage(struct page *page,
struct inode *inode = page->mapping->host;
if (test_opt(inode->i_sb, NOBH))
return nobh_writepage(page,
ext4_normal_get_block_write, wbc);
return nobh_writepage(page, noalloc_get_block_write, wbc);
else
return block_write_full_page(page,
ext4_normal_get_block_write,
wbc);
return block_write_full_page(page, noalloc_get_block_write,
wbc);
}
static int ext4_normal_writepage(struct page *page,
@ -3142,7 +3297,7 @@ static int __ext4_journalled_writepage(struct page *page,
int err;
ret = block_prepare_write(page, 0, PAGE_CACHE_SIZE,
ext4_normal_get_block_write);
noalloc_get_block_write);
if (ret != 0)
goto out_unlock;
@ -3227,9 +3382,8 @@ static int ext4_journalled_writepage(struct page *page,
* really know unless we go poke around in the buffer_heads.
* But block_write_full_page will do the right thing.
*/
return block_write_full_page(page,
ext4_normal_get_block_write,
wbc);
return block_write_full_page(page, noalloc_get_block_write,
wbc);
}
no_write:
redirty_page_for_writepage(wbc, page);
@ -3973,7 +4127,8 @@ void ext4_truncate(struct inode *inode)
if (!ext4_can_truncate(inode))
return;
if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC))
if (ei->i_disksize && inode->i_size == 0 &&
!test_opt(inode->i_sb, NO_AUTO_DA_ALLOC))
ei->i_state |= EXT4_STATE_DA_ALLOC_CLOSE;
if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
@ -4715,25 +4870,6 @@ int ext4_write_inode(struct inode *inode, int wait)
return ext4_force_commit(inode->i_sb);
}
int __ext4_write_dirty_metadata(struct inode *inode, struct buffer_head *bh)
{
int err = 0;
mark_buffer_dirty(bh);
if (inode && inode_needs_sync(inode)) {
sync_dirty_buffer(bh);
if (buffer_req(bh) && !buffer_uptodate(bh)) {
ext4_error(inode->i_sb, __func__,
"IO error syncing inode, "
"inode=%lu, block=%llu",
inode->i_ino,
(unsigned long long)bh->b_blocknr);
err = -EIO;
}
}
return err;
}
/*
* ext4_setattr()
*
@ -4930,7 +5066,8 @@ static int ext4_index_trans_blocks(struct inode *inode, int nrblocks, int chunk)
*/
int ext4_meta_trans_blocks(struct inode *inode, int nrblocks, int chunk)
{
int groups, gdpblocks;
ext4_group_t groups, ngroups = ext4_get_groups_count(inode->i_sb);
int gdpblocks;
int idxblocks;
int ret = 0;
@ -4957,8 +5094,8 @@ int ext4_meta_trans_blocks(struct inode *inode, int nrblocks, int chunk)
groups += nrblocks;
gdpblocks = groups;
if (groups > EXT4_SB(inode->i_sb)->s_groups_count)
groups = EXT4_SB(inode->i_sb)->s_groups_count;
if (groups > ngroups)
groups = ngroups;
if (groups > EXT4_SB(inode->i_sb)->s_gdb_count)
gdpblocks = EXT4_SB(inode->i_sb)->s_gdb_count;
@ -4998,7 +5135,7 @@ int ext4_writepage_trans_blocks(struct inode *inode)
* Calculate the journal credits for a chunk of data modification.
*
* This is called from DIO, fallocate or whoever calling
* ext4_get_blocks_wrap() to map/allocate a chunk of contigous disk blocks.
* ext4_get_blocks() to map/allocate a chunk of contigous disk blocks.
*
* journal buffers for data blocks are not included here, as DIO
* and fallocate do no need to journal data buffers.

166
fs/ext4/mballoc.c
Просмотреть файл

@ -372,24 +372,12 @@ static inline void mb_set_bit(int bit, void *addr)
ext4_set_bit(bit, addr);
}
static inline void mb_set_bit_atomic(spinlock_t *lock, int bit, void *addr)
{
addr = mb_correct_addr_and_bit(&bit, addr);
ext4_set_bit_atomic(lock, bit, addr);
}
static inline void mb_clear_bit(int bit, void *addr)
{
addr = mb_correct_addr_and_bit(&bit, addr);
ext4_clear_bit(bit, addr);
}
static inline void mb_clear_bit_atomic(spinlock_t *lock, int bit, void *addr)
{
addr = mb_correct_addr_and_bit(&bit, addr);
ext4_clear_bit_atomic(lock, bit, addr);
}
static inline int mb_find_next_zero_bit(void *addr, int max, int start)
{
int fix = 0, ret, tmpmax;
@ -448,7 +436,7 @@ static void mb_free_blocks_double(struct inode *inode, struct ext4_buddy *e4b,
if (unlikely(e4b->bd_info->bb_bitmap == NULL))
return;
BUG_ON(!ext4_is_group_locked(sb, e4b->bd_group));
assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group));
for (i = 0; i < count; i++) {
if (!mb_test_bit(first + i, e4b->bd_info->bb_bitmap)) {
ext4_fsblk_t blocknr;
@ -472,7 +460,7 @@ static void mb_mark_used_double(struct ext4_buddy *e4b, int first, int count)
if (unlikely(e4b->bd_info->bb_bitmap == NULL))
return;
BUG_ON(!ext4_is_group_locked(e4b->bd_sb, e4b->bd_group));
assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group));
for (i = 0; i < count; i++) {
BUG_ON(mb_test_bit(first + i, e4b->bd_info->bb_bitmap));
mb_set_bit(first + i, e4b->bd_info->bb_bitmap);
@ -739,6 +727,7 @@ static void ext4_mb_generate_buddy(struct super_block *sb,
static int ext4_mb_init_cache(struct page *page, char *incore)
{
ext4_group_t ngroups;
int blocksize;
int blocks_per_page;
int groups_per_page;
@ -757,6 +746,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
inode = page->mapping->host;
sb = inode->i_sb;
ngroups = ext4_get_groups_count(sb);
blocksize = 1 << inode->i_blkbits;
blocks_per_page = PAGE_CACHE_SIZE / blocksize;
@ -780,7 +770,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
for (i = 0; i < groups_per_page; i++) {
struct ext4_group_desc *desc;
if (first_group + i >= EXT4_SB(sb)->s_groups_count)
if (first_group + i >= ngroups)
break;
err = -EIO;
@ -801,17 +791,17 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
unlock_buffer(bh[i]);
continue;
}
spin_lock(sb_bgl_lock(EXT4_SB(sb), first_group + i));
ext4_lock_group(sb, first_group + i);
if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
ext4_init_block_bitmap(sb, bh[i],
first_group + i, desc);
set_bitmap_uptodate(bh[i]);
set_buffer_uptodate(bh[i]);
spin_unlock(sb_bgl_lock(EXT4_SB(sb), first_group + i));
ext4_unlock_group(sb, first_group + i);
unlock_buffer(bh[i]);
continue;
}
spin_unlock(sb_bgl_lock(EXT4_SB(sb), first_group + i));
ext4_unlock_group(sb, first_group + i);
if (buffer_uptodate(bh[i])) {
/*
* if not uninit if bh is uptodate,
@ -852,7 +842,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
struct ext4_group_info *grinfo;
group = (first_block + i) >> 1;
if (group >= EXT4_SB(sb)->s_groups_count)
if (group >= ngroups)
break;
/*
@ -1078,7 +1068,7 @@ static int mb_find_order_for_block(struct ext4_buddy *e4b, int block)
return 0;
}
static void mb_clear_bits(spinlock_t *lock, void *bm, int cur, int len)
static void mb_clear_bits(void *bm, int cur, int len)
{
__u32 *addr;
@ -1091,15 +1081,12 @@ static void mb_clear_bits(spinlock_t *lock, void *bm, int cur, int len)
cur += 32;
continue;
}
if (lock)
mb_clear_bit_atomic(lock, cur, bm);
else
mb_clear_bit(cur, bm);
mb_clear_bit(cur, bm);
cur++;
}
}
static void mb_set_bits(spinlock_t *lock, void *bm, int cur, int len)
static void mb_set_bits(void *bm, int cur, int len)
{
__u32 *addr;
@ -1112,10 +1099,7 @@ static void mb_set_bits(spinlock_t *lock, void *bm, int cur, int len)
cur += 32;
continue;
}
if (lock)
mb_set_bit_atomic(lock, cur, bm);
else
mb_set_bit(cur, bm);
mb_set_bit(cur, bm);
cur++;
}
}
@ -1131,7 +1115,7 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
struct super_block *sb = e4b->bd_sb;
BUG_ON(first + count > (sb->s_blocksize << 3));
BUG_ON(!ext4_is_group_locked(sb, e4b->bd_group));
assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group));
mb_check_buddy(e4b);
mb_free_blocks_double(inode, e4b, first, count);
@ -1212,7 +1196,7 @@ static int mb_find_extent(struct ext4_buddy *e4b, int order, int block,
int ord;
void *buddy;
BUG_ON(!ext4_is_group_locked(e4b->bd_sb, e4b->bd_group));
assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group));
BUG_ON(ex == NULL);
buddy = mb_find_buddy(e4b, order, &max);
@ -1276,7 +1260,7 @@ static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex)
BUG_ON(start + len > (e4b->bd_sb->s_blocksize << 3));
BUG_ON(e4b->bd_group != ex->fe_group);
BUG_ON(!ext4_is_group_locked(e4b->bd_sb, e4b->bd_group));
assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group));
mb_check_buddy(e4b);
mb_mark_used_double(e4b, start, len);
@ -1330,8 +1314,7 @@ static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex)
e4b->bd_info->bb_counters[ord]++;
}
mb_set_bits(sb_bgl_lock(EXT4_SB(e4b->bd_sb), ex->fe_group),
EXT4_MB_BITMAP(e4b), ex->fe_start, len0);
mb_set_bits(EXT4_MB_BITMAP(e4b), ex->fe_start, len0);
mb_check_buddy(e4b);
return ret;
@ -1726,7 +1709,6 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac,
unsigned free, fragments;
unsigned i, bits;
int flex_size = ext4_flex_bg_size(EXT4_SB(ac->ac_sb));
struct ext4_group_desc *desc;
struct ext4_group_info *grp = ext4_get_group_info(ac->ac_sb, group);
BUG_ON(cr < 0 || cr >= 4);
@ -1742,10 +1724,6 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac,
switch (cr) {
case 0:
BUG_ON(ac->ac_2order == 0);
/* If this group is uninitialized, skip it initially */
desc = ext4_get_group_desc(ac->ac_sb, group, NULL);
if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))
return 0;
/* Avoid using the first bg of a flexgroup for data files */
if ((ac->ac_flags & EXT4_MB_HINT_DATA) &&
@ -1788,6 +1766,7 @@ int ext4_mb_get_buddy_cache_lock(struct super_block *sb, ext4_group_t group)
int block, pnum;
int blocks_per_page;
int groups_per_page;
ext4_group_t ngroups = ext4_get_groups_count(sb);
ext4_group_t first_group;
struct ext4_group_info *grp;
@ -1807,7 +1786,7 @@ int ext4_mb_get_buddy_cache_lock(struct super_block *sb, ext4_group_t group)
/* read all groups the page covers into the cache */
for (i = 0; i < groups_per_page; i++) {
if ((first_group + i) >= EXT4_SB(sb)->s_groups_count)
if ((first_group + i) >= ngroups)
break;
grp = ext4_get_group_info(sb, first_group + i);
/* take all groups write allocation
@ -1945,8 +1924,7 @@ err:
static noinline_for_stack int
ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
{
ext4_group_t group;
ext4_group_t i;
ext4_group_t ngroups, group, i;
int cr;
int err = 0;
int bsbits;
@ -1957,6 +1935,7 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
sb = ac->ac_sb;
sbi = EXT4_SB(sb);
ngroups = ext4_get_groups_count(sb);
BUG_ON(ac->ac_status == AC_STATUS_FOUND);
/* first, try the goal */
@ -2017,11 +1996,11 @@ repeat:
*/
group = ac->ac_g_ex.fe_group;
for (i = 0; i < EXT4_SB(sb)->s_groups_count; group++, i++) {
for (i = 0; i < ngroups; group++, i++) {
struct ext4_group_info *grp;
struct ext4_group_desc *desc;
if (group == EXT4_SB(sb)->s_groups_count)
if (group == ngroups)
group = 0;
/* quick check to skip empty groups */
@ -2064,9 +2043,7 @@ repeat:
ac->ac_groups_scanned++;
desc = ext4_get_group_desc(sb, group, NULL);
if (cr == 0 || (desc->bg_flags &
cpu_to_le16(EXT4_BG_BLOCK_UNINIT) &&
ac->ac_2order != 0))
if (cr == 0)
ext4_mb_simple_scan_group(ac, &e4b);
else if (cr == 1 &&
ac->ac_g_ex.fe_len == sbi->s_stripe)
@ -2315,12 +2292,10 @@ static struct file_operations ext4_mb_seq_history_fops = {
static void *ext4_mb_seq_groups_start(struct seq_file *seq, loff_t *pos)
{
struct super_block *sb = seq->private;
struct ext4_sb_info *sbi = EXT4_SB(sb);
ext4_group_t group;
if (*pos < 0 || *pos >= sbi->s_groups_count)
if (*pos < 0 || *pos >= ext4_get_groups_count(sb))
return NULL;
group = *pos + 1;
return (void *) ((unsigned long) group);
}
@ -2328,11 +2303,10 @@ static void *ext4_mb_seq_groups_start(struct seq_file *seq, loff_t *pos)
static void *ext4_mb_seq_groups_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct super_block *sb = seq->private;
struct ext4_sb_info *sbi = EXT4_SB(sb);
ext4_group_t group;
++*pos;
if (*pos < 0 || *pos >= sbi->s_groups_count)
if (*pos < 0 || *pos >= ext4_get_groups_count(sb))
return NULL;
group = *pos + 1;
return (void *) ((unsigned long) group);
@ -2420,7 +2394,8 @@ static void ext4_mb_history_release(struct super_block *sb)
if (sbi->s_proc != NULL) {
remove_proc_entry("mb_groups", sbi->s_proc);
remove_proc_entry("mb_history", sbi->s_proc);
if (sbi->s_mb_history_max)
remove_proc_entry("mb_history", sbi->s_proc);
}
kfree(sbi->s_mb_history);
}
@ -2431,17 +2406,17 @@ static void ext4_mb_history_init(struct super_block *sb)
int i;
if (sbi->s_proc != NULL) {
proc_create_data("mb_history", S_IRUGO, sbi->s_proc,
&ext4_mb_seq_history_fops, sb);
if (sbi->s_mb_history_max)
proc_create_data("mb_history", S_IRUGO, sbi->s_proc,
&ext4_mb_seq_history_fops, sb);
proc_create_data("mb_groups", S_IRUGO, sbi->s_proc,
&ext4_mb_seq_groups_fops, sb);
}
sbi->s_mb_history_max = 1000;
sbi->s_mb_history_cur = 0;
spin_lock_init(&sbi->s_mb_history_lock);
i = sbi->s_mb_history_max * sizeof(struct ext4_mb_history);
sbi->s_mb_history = kzalloc(i, GFP_KERNEL);
sbi->s_mb_history = i ? kzalloc(i, GFP_KERNEL) : NULL;
/* if we can't allocate history, then we simple won't use it */
}
@ -2451,7 +2426,7 @@ ext4_mb_store_history(struct ext4_allocation_context *ac)
struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
struct ext4_mb_history h;
if (unlikely(sbi->s_mb_history == NULL))
if (sbi->s_mb_history == NULL)
return;
if (!(ac->ac_op & sbi->s_mb_history_filter))
@ -2587,6 +2562,7 @@ void ext4_mb_update_group_info(struct ext4_group_info *grp, ext4_grpblk_t add)
static int ext4_mb_init_backend(struct super_block *sb)
{
ext4_group_t ngroups = ext4_get_groups_count(sb);
ext4_group_t i;
int metalen;
struct ext4_sb_info *sbi = EXT4_SB(sb);
@ -2598,7 +2574,7 @@ static int ext4_mb_init_backend(struct super_block *sb)
struct ext4_group_desc *desc;
/* This is the number of blocks used by GDT */
num_meta_group_infos = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) -
num_meta_group_infos = (ngroups + EXT4_DESC_PER_BLOCK(sb) -
1) >> EXT4_DESC_PER_BLOCK_BITS(sb);
/*
@ -2644,7 +2620,7 @@ static int ext4_mb_init_backend(struct super_block *sb)
for (i = 0; i < num_meta_group_infos; i++) {
if ((i + 1) == num_meta_group_infos)
metalen = sizeof(*meta_group_info) *
(sbi->s_groups_count -
(ngroups -
(i << EXT4_DESC_PER_BLOCK_BITS(sb)));
meta_group_info = kmalloc(metalen, GFP_KERNEL);
if (meta_group_info == NULL) {
@ -2655,7 +2631,7 @@ static int ext4_mb_init_backend(struct super_block *sb)
sbi->s_group_info[i] = meta_group_info;
}
for (i = 0; i < sbi->s_groups_count; i++) {
for (i = 0; i < ngroups; i++) {
desc = ext4_get_group_desc(sb, i, NULL);
if (desc == NULL) {
printk(KERN_ERR
@ -2761,7 +2737,7 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
return 0;
}
/* need to called with ext4 group lock (ext4_lock_group) */
/* need to called with the ext4 group lock held */
static void ext4_mb_cleanup_pa(struct ext4_group_info *grp)
{
struct ext4_prealloc_space *pa;
@ -2781,13 +2757,14 @@ static void ext4_mb_cleanup_pa(struct ext4_group_info *grp)
int ext4_mb_release(struct super_block *sb)
{
ext4_group_t ngroups = ext4_get_groups_count(sb);
ext4_group_t i;
int num_meta_group_infos;
struct ext4_group_info *grinfo;
struct ext4_sb_info *sbi = EXT4_SB(sb);
if (sbi->s_group_info) {
for (i = 0; i < sbi->s_groups_count; i++) {
for (i = 0; i < ngroups; i++) {
grinfo = ext4_get_group_info(sb, i);
#ifdef DOUBLE_CHECK
kfree(grinfo->bb_bitmap);
@ -2797,7 +2774,7 @@ int ext4_mb_release(struct super_block *sb)
ext4_unlock_group(sb, i);
kfree(grinfo);
}
num_meta_group_infos = (sbi->s_groups_count +
num_meta_group_infos = (ngroups +
EXT4_DESC_PER_BLOCK(sb) - 1) >>
EXT4_DESC_PER_BLOCK_BITS(sb);
for (i = 0; i < num_meta_group_infos; i++)
@ -2984,27 +2961,25 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
+ le32_to_cpu(es->s_first_data_block);
len = ac->ac_b_ex.fe_len;
if (in_range(ext4_block_bitmap(sb, gdp), block, len) ||
in_range(ext4_inode_bitmap(sb, gdp), block, len) ||
in_range(block, ext4_inode_table(sb, gdp),
EXT4_SB(sb)->s_itb_per_group) ||
in_range(block + len - 1, ext4_inode_table(sb, gdp),
EXT4_SB(sb)->s_itb_per_group)) {
if (!ext4_data_block_valid(sbi, block, len)) {
ext4_error(sb, __func__,
"Allocating block %llu in system zone of %d group\n",
block, ac->ac_b_ex.fe_group);
"Allocating blocks %llu-%llu which overlap "
"fs metadata\n", block, block+len);
/* File system mounted not to panic on error
* Fix the bitmap and repeat the block allocation
* We leak some of the blocks here.
*/
mb_set_bits(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group),
bitmap_bh->b_data, ac->ac_b_ex.fe_start,
ac->ac_b_ex.fe_len);
ext4_lock_group(sb, ac->ac_b_ex.fe_group);
mb_set_bits(bitmap_bh->b_data, ac->ac_b_ex.fe_start,
ac->ac_b_ex.fe_len);
ext4_unlock_group(sb, ac->ac_b_ex.fe_group);
err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
if (!err)
err = -EAGAIN;
goto out_err;
}
ext4_lock_group(sb, ac->ac_b_ex.fe_group);
#ifdef AGGRESSIVE_CHECK
{
int i;
@ -3014,9 +2989,7 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
}
}
#endif
spin_lock(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group));
mb_set_bits(NULL, bitmap_bh->b_data,
ac->ac_b_ex.fe_start, ac->ac_b_ex.fe_len);
mb_set_bits(bitmap_bh->b_data, ac->ac_b_ex.fe_start,ac->ac_b_ex.fe_len);
if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
ext4_free_blks_set(sb, gdp,
@ -3026,7 +2999,8 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
len = ext4_free_blks_count(sb, gdp) - ac->ac_b_ex.fe_len;
ext4_free_blks_set(sb, gdp, len);
gdp->bg_checksum = ext4_group_desc_csum(sbi, ac->ac_b_ex.fe_group, gdp);
spin_unlock(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group));
ext4_unlock_group(sb, ac->ac_b_ex.fe_group);
percpu_counter_sub(&sbi->s_freeblocks_counter, ac->ac_b_ex.fe_len);
/*
* Now reduce the dirty block count also. Should not go negative
@ -3459,7 +3433,7 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
* the function goes through all block freed in the group
* but not yet committed and marks them used in in-core bitmap.
* buddy must be generated from this bitmap
* Need to be called with ext4 group lock (ext4_lock_group)
* Need to be called with the ext4 group lock held
*/
static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap,
ext4_group_t group)
@ -3473,9 +3447,7 @@ static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap,
while (n) {
entry = rb_entry(n, struct ext4_free_data, node);
mb_set_bits(sb_bgl_lock(EXT4_SB(sb), group),
bitmap, entry->start_blk,
entry->count);
mb_set_bits(bitmap, entry->start_blk, entry->count);
n = rb_next(n);
}
return;
@ -3484,7 +3456,7 @@ static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap,
/*
* the function goes through all preallocation in this group and marks them
* used in in-core bitmap. buddy must be generated from this bitmap
* Need to be called with ext4 group lock (ext4_lock_group)
* Need to be called with ext4 group lock held
*/
static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
ext4_group_t group)
@ -3516,8 +3488,7 @@ static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
if (unlikely(len == 0))
continue;
BUG_ON(groupnr != group);
mb_set_bits(sb_bgl_lock(EXT4_SB(sb), group),
bitmap, start, len);
mb_set_bits(bitmap, start, len);
preallocated += len;
count++;
}
@ -4121,7 +4092,7 @@ static void ext4_mb_return_to_preallocation(struct inode *inode,
static void ext4_mb_show_ac(struct ext4_allocation_context *ac)
{
struct super_block *sb = ac->ac_sb;
ext4_group_t i;
ext4_group_t ngroups, i;
printk(KERN_ERR "EXT4-fs: Can't allocate:"
" Allocation context details:\n");
@ -4145,7 +4116,8 @@ static void ext4_mb_show_ac(struct ext4_allocation_context *ac)
printk(KERN_ERR "EXT4-fs: %lu scanned, %d found\n", ac->ac_ex_scanned,
ac->ac_found);
printk(KERN_ERR "EXT4-fs: groups: \n");
for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
ngroups = ext4_get_groups_count(sb);
for (i = 0; i < ngroups; i++) {
struct ext4_group_info *grp = ext4_get_group_info(sb, i);
struct ext4_prealloc_space *pa;
ext4_grpblk_t start;
@ -4469,13 +4441,13 @@ static int ext4_mb_release_context(struct ext4_allocation_context *ac)
static int ext4_mb_discard_preallocations(struct super_block *sb, int needed)
{
ext4_group_t i;
ext4_group_t i, ngroups = ext4_get_groups_count(sb);
int ret;
int freed = 0;
trace_mark(ext4_mb_discard_preallocations, "dev %s needed %d",
sb->s_id, needed);
for (i = 0; i < EXT4_SB(sb)->s_groups_count && needed > 0; i++) {
for (i = 0; i < ngroups && needed > 0; i++) {
ret = ext4_mb_discard_group_preallocations(sb, i, needed);
freed += ret;
needed -= ret;
@ -4859,29 +4831,25 @@ do_more:
new_entry->group = block_group;
new_entry->count = count;
new_entry->t_tid = handle->h_transaction->t_tid;
ext4_lock_group(sb, block_group);
mb_clear_bits(sb_bgl_lock(sbi, block_group), bitmap_bh->b_data,
bit, count);
mb_clear_bits(bitmap_bh->b_data, bit, count);
ext4_mb_free_metadata(handle, &e4b, new_entry);
ext4_unlock_group(sb, block_group);
} else {
ext4_lock_group(sb, block_group);
/* need to update group_info->bb_free and bitmap
* with group lock held. generate_buddy look at
* them with group lock_held
*/
mb_clear_bits(sb_bgl_lock(sbi, block_group), bitmap_bh->b_data,
bit, count);
ext4_lock_group(sb, block_group);
mb_clear_bits(bitmap_bh->b_data, bit, count);
mb_free_blocks(inode, &e4b, bit, count);
ext4_mb_return_to_preallocation(inode, &e4b, block, count);
ext4_unlock_group(sb, block_group);
}
spin_lock(sb_bgl_lock(sbi, block_group));
ret = ext4_free_blks_count(sb, gdp) + count;
ext4_free_blks_set(sb, gdp, ret);
gdp->bg_checksum = ext4_group_desc_csum(sbi, block_group, gdp);
spin_unlock(sb_bgl_lock(sbi, block_group));
ext4_unlock_group(sb, block_group);
percpu_counter_add(&sbi->s_freeblocks_counter, count);
if (sbi->s_log_groups_per_flex) {

1
fs/ext4/mballoc.h
Просмотреть файл

@ -23,7 +23,6 @@
#include <linux/mutex.h>
#include "ext4_jbd2.h"
#include "ext4.h"
#include "group.h"
/*
* with AGGRESSIVE_CHECK allocator runs consistency checks over

27
fs/ext4/namei.c
Просмотреть файл

@ -37,7 +37,6 @@
#include "ext4.h"
#include "ext4_jbd2.h"
#include "namei.h"
#include "xattr.h"
#include "acl.h"
@ -750,7 +749,7 @@ static int dx_make_map(struct ext4_dir_entry_2 *de, unsigned blocksize,
ext4fs_dirhash(de->name, de->name_len, &h);
map_tail--;
map_tail->hash = h.hash;
map_tail->offs = (u16) ((char *) de - base);
map_tail->offs = ((char *) de - base)>>2;
map_tail->size = le16_to_cpu(de->rec_len);
count++;
cond_resched();
@ -1148,7 +1147,8 @@ dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count,
unsigned rec_len = 0;
while (count--) {
struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) (from + map->offs);
struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)
(from + (map->offs<<2));
rec_len = EXT4_DIR_REC_LEN(de->name_len);
memcpy (to, de, rec_len);
((struct ext4_dir_entry_2 *) to)->rec_len =
@ -1997,7 +1997,7 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
if (!ext4_handle_valid(handle))
return 0;
lock_super(sb);
mutex_lock(&EXT4_SB(sb)->s_orphan_lock);
if (!list_empty(&EXT4_I(inode)->i_orphan))
goto out_unlock;
@ -2006,9 +2006,13 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
/* @@@ FIXME: Observation from aviro:
* I think I can trigger J_ASSERT in ext4_orphan_add(). We block
* here (on lock_super()), so race with ext4_link() which might bump
* here (on s_orphan_lock), so race with ext4_link() which might bump
* ->i_nlink. For, say it, character device. Not a regular file,
* not a directory, not a symlink and ->i_nlink > 0.
*
* tytso, 4/25/2009: I'm not sure how that could happen;
* shouldn't the fs core protect us from these sort of
* unlink()/link() races?
*/
J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
@ -2045,7 +2049,7 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
jbd_debug(4, "orphan inode %lu will point to %d\n",
inode->i_ino, NEXT_ORPHAN(inode));
out_unlock:
unlock_super(sb);
mutex_unlock(&EXT4_SB(sb)->s_orphan_lock);
ext4_std_error(inode->i_sb, err);
return err;
}
@ -2066,11 +2070,9 @@ int ext4_orphan_del(handle_t *handle, struct inode *inode)
if (!ext4_handle_valid(handle))
return 0;
lock_super(inode->i_sb);
if (list_empty(&ei->i_orphan)) {
unlock_super(inode->i_sb);
return 0;
}
mutex_lock(&EXT4_SB(inode->i_sb)->s_orphan_lock);
if (list_empty(&ei->i_orphan))
goto out;
ino_next = NEXT_ORPHAN(inode);
prev = ei->i_orphan.prev;
@ -2120,7 +2122,7 @@ int ext4_orphan_del(handle_t *handle, struct inode *inode)
out_err:
ext4_std_error(inode->i_sb, err);
out:
unlock_super(inode->i_sb);
mutex_unlock(&EXT4_SB(inode->i_sb)->s_orphan_lock);
return err;
out_brelse:
@ -2533,6 +2535,7 @@ const struct inode_operations ext4_dir_inode_operations = {
.removexattr = generic_removexattr,
#endif
.permission = ext4_permission,
.fiemap = ext4_fiemap,
};
const struct inode_operations ext4_special_inode_operations = {

8
fs/ext4/namei.h
Просмотреть файл

@ -1,8 +0,0 @@
/* linux/fs/ext4/namei.h
*
* Copyright (C) 2005 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
*/
extern struct dentry *ext4_get_parent(struct dentry *child);

36
fs/ext4/resize.c
Просмотреть файл

@ -15,7 +15,6 @@
#include <linux/slab.h>
#include "ext4_jbd2.h"
#include "group.h"
#define outside(b, first, last) ((b) < (first) || (b) >= (last))
#define inside(b, first, last) ((b) >= (first) && (b) < (last))
@ -193,7 +192,7 @@ static int setup_new_group_blocks(struct super_block *sb,
if (IS_ERR(handle))
return PTR_ERR(handle);
lock_super(sb);
mutex_lock(&sbi->s_resize_lock);
if (input->group != sbi->s_groups_count) {
err = -EBUSY;
goto exit_journal;
@ -302,7 +301,7 @@ exit_bh:
brelse(bh);
exit_journal:
unlock_super(sb);
mutex_unlock(&sbi->s_resize_lock);
if ((err2 = ext4_journal_stop(handle)) && !err)
err = err2;
@ -643,11 +642,12 @@ exit_free:
* important part is that the new block and inode counts are in the backup
* superblocks, and the location of the new group metadata in the GDT backups.
*
* We do not need lock_super() for this, because these blocks are not
* otherwise touched by the filesystem code when it is mounted. We don't
* need to worry about last changing from sbi->s_groups_count, because the
* worst that can happen is that we do not copy the full number of backups
* at this time. The resize which changed s_groups_count will backup again.
* We do not need take the s_resize_lock for this, because these
* blocks are not otherwise touched by the filesystem code when it is
* mounted. We don't need to worry about last changing from
* sbi->s_groups_count, because the worst that can happen is that we
* do not copy the full number of backups at this time. The resize
* which changed s_groups_count will backup again.
*/
static void update_backups(struct super_block *sb,
int blk_off, char *data, int size)
@ -809,7 +809,7 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
goto exit_put;
}
lock_super(sb);
mutex_lock(&sbi->s_resize_lock);
if (input->group != sbi->s_groups_count) {
ext4_warning(sb, __func__,
"multiple resizers run on filesystem!");
@ -840,7 +840,7 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
/*
* OK, now we've set up the new group. Time to make it active.
*
* Current kernels don't lock all allocations via lock_super(),
* We do not lock all allocations via s_resize_lock
* so we have to be safe wrt. concurrent accesses the group
* data. So we need to be careful to set all of the relevant
* group descriptor data etc. *before* we enable the group.
@ -900,12 +900,12 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
*
* The precise rules we use are:
*
* * Writers of s_groups_count *must* hold lock_super
* * Writers of s_groups_count *must* hold s_resize_lock
* AND
* * Writers must perform a smp_wmb() after updating all dependent
* data and before modifying the groups count
*
* * Readers must hold lock_super() over the access
* * Readers must hold s_resize_lock over the access
* OR
* * Readers must perform an smp_rmb() after reading the groups count
* and before reading any dependent data.
@ -948,7 +948,7 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
sb->s_dirt = 1;
exit_journal:
unlock_super(sb);
mutex_unlock(&sbi->s_resize_lock);
if ((err2 = ext4_journal_stop(handle)) && !err)
err = err2;
if (!err) {
@ -986,7 +986,7 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
/* We don't need to worry about locking wrt other resizers just
* yet: we're going to revalidate es->s_blocks_count after
* taking lock_super() below. */
* taking the s_resize_lock below. */
o_blocks_count = ext4_blocks_count(es);
o_groups_count = EXT4_SB(sb)->s_groups_count;
@ -1056,11 +1056,11 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
goto exit_put;
}
lock_super(sb);
mutex_lock(&EXT4_SB(sb)->s_resize_lock);
if (o_blocks_count != ext4_blocks_count(es)) {
ext4_warning(sb, __func__,
"multiple resizers run on filesystem!");
unlock_super(sb);
mutex_unlock(&EXT4_SB(sb)->s_resize_lock);
ext4_journal_stop(handle);
err = -EBUSY;
goto exit_put;
@ -1070,14 +1070,14 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
EXT4_SB(sb)->s_sbh))) {
ext4_warning(sb, __func__,
"error %d on journal write access", err);
unlock_super(sb);
mutex_unlock(&EXT4_SB(sb)->s_resize_lock);
ext4_journal_stop(handle);
goto exit_put;
}
ext4_blocks_count_set(es, o_blocks_count + add);
ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh);
sb->s_dirt = 1;
unlock_super(sb);
mutex_unlock(&EXT4_SB(sb)->s_resize_lock);
ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
o_blocks_count + add);
/* We add the blocks to the bitmap and set the group need init bit */

831
fs/ext4/super.c
Просмотреть файл

Разница между файлами не показана из-за своего большого размера Загрузить разницу

14
fs/ioctl.c
Просмотреть файл

@ -414,10 +414,6 @@ static int file_ioctl(struct file *filp, unsigned int cmd,
switch (cmd) {
case FIBMAP:
return ioctl_fibmap(filp, p);
case FS_IOC_FIEMAP:
return ioctl_fiemap(filp, arg);
case FIGETBSZ:
return put_user(inode->i_sb->s_blocksize, p);
case FIONREAD:
return put_user(i_size_read(inode) - filp->f_pos, p);
}
@ -557,6 +553,16 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
error = ioctl_fsthaw(filp);
break;
case FS_IOC_FIEMAP:
return ioctl_fiemap(filp, arg);
case FIGETBSZ:
{
struct inode *inode = filp->f_path.dentry->d_inode;
int __user *p = (int __user *)arg;
return put_user(inode->i_sb->s_blocksize, p);
}
default:
if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
error = file_ioctl(filp, cmd, arg);

8
fs/jbd2/journal.c
Просмотреть файл

@ -1781,7 +1781,7 @@ int jbd2_journal_wipe(journal_t *journal, int write)
* Journal abort has very specific semantics, which we describe
* for journal abort.
*
* Two internal function, which provide abort to te jbd layer
* Two internal functions, which provide abort to the jbd layer
* itself are here.
*/
@ -1879,7 +1879,7 @@ void jbd2_journal_abort(journal_t *journal, int errno)
* int jbd2_journal_errno () - returns the journal's error state.
* @journal: journal to examine.
*
* This is the errno numbet set with jbd2_journal_abort(), the last
* This is the errno number set with jbd2_journal_abort(), the last
* time the journal was mounted - if the journal was stopped
* without calling abort this will be 0.
*
@ -1903,7 +1903,7 @@ int jbd2_journal_errno(journal_t *journal)
* int jbd2_journal_clear_err () - clears the journal's error state
* @journal: journal to act on.
*
* An error must be cleared or Acked to take a FS out of readonly
* An error must be cleared or acked to take a FS out of readonly
* mode.
*/
int jbd2_journal_clear_err(journal_t *journal)
@ -1923,7 +1923,7 @@ int jbd2_journal_clear_err(journal_t *journal)
* void jbd2_journal_ack_err() - Ack journal err.
* @journal: journal to act on.
*
* An error must be cleared or Acked to take a FS out of readonly
* An error must be cleared or acked to take a FS out of readonly
* mode.
*/
void jbd2_journal_ack_err(journal_t *journal)

6
fs/mpage.c
Просмотреть файл

@ -379,7 +379,8 @@ mpage_readpages(struct address_space *mapping, struct list_head *pages,
struct buffer_head map_bh;
unsigned long first_logical_block = 0;
clear_buffer_mapped(&map_bh);
map_bh.b_state = 0;
map_bh.b_size = 0;
for (page_idx = 0; page_idx < nr_pages; page_idx++) {
struct page *page = list_entry(pages->prev, struct page, lru);
@ -412,7 +413,8 @@ int mpage_readpage(struct page *page, get_block_t get_block)
struct buffer_head map_bh;
unsigned long first_logical_block = 0;
clear_buffer_mapped(&map_bh);
map_bh.b_state = 0;
map_bh.b_size = 0;
bio = do_mpage_readpage(bio, page, 1, &last_block_in_bio,
&map_bh, &first_logical_block, get_block);
if (bio)