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ext4: minor cleanup of ext4_da_reserve_space() 

Remove outdated comments and dead code from ext4_da_reserve_space.
Clean up its trace point, and relocate it to make it more useful.

While we're at it, fix a nearby conditional used to determine if
we have a non-bigalloc file system.  It doesn't match usage elsewhere
in the code, and misleadingly suggests that an s_cluster_ratio value
of 0 would be legal.

Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Whitney 2015-06-21 21:37:05 -04:00 коммит произвёл Theodore Ts'o
Родитель 292db1bc6c
Коммит c27e43a10c
2 изменённых файлов: 9 добавлений и 23 удалений
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22
fs/ext4/inode.c
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@ -1261,13 +1261,12 @@ static int ext4_journalled_write_end(struct file *file,
}
/*
* Reserve a single cluster located at lblock
* Reserve space for a single cluster
*/
static int ext4_da_reserve_space(struct inode *inode, ext4_lblk_t lblock)
static int ext4_da_reserve_space(struct inode *inode)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct ext4_inode_info *ei = EXT4_I(inode);
unsigned int md_needed;
int ret;
/*
@ -1279,25 +1278,14 @@ static int ext4_da_reserve_space(struct inode *inode, ext4_lblk_t lblock)
if (ret)
return ret;
/*
* recalculate the amount of metadata blocks to reserve
* in order to allocate nrblocks
* worse case is one extent per block
*/
spin_lock(&ei->i_block_reservation_lock);
/*
* ext4_calc_metadata_amount() has side effects, which we have
* to be prepared undo if we fail to claim space.
*/
md_needed = 0;
trace_ext4_da_reserve_space(inode, 0);
if (ext4_claim_free_clusters(sbi, 1, 0)) {
spin_unlock(&ei->i_block_reservation_lock);
dquot_release_reservation_block(inode, EXT4_C2B(sbi, 1));
return -ENOSPC;
}
ei->i_reserved_data_blocks++;
trace_ext4_da_reserve_space(inode);
spin_unlock(&ei->i_block_reservation_lock);
return 0; /* success */
@ -1566,9 +1554,9 @@ add_delayed:
* then we don't need to reserve it again. However we still need
* to reserve metadata for every block we're going to write.
*/
if (EXT4_SB(inode->i_sb)->s_cluster_ratio <= 1 ||
if (EXT4_SB(inode->i_sb)->s_cluster_ratio == 1 ||
!ext4_find_delalloc_cluster(inode, map->m_lblk)) {
ret = ext4_da_reserve_space(inode, iblock);
ret = ext4_da_reserve_space(inode);
if (ret) {
/* not enough space to reserve */
retval = ret;

10
include/trace/events/ext4.h
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@ -1185,15 +1185,14 @@ TRACE_EVENT(ext4_da_update_reserve_space,
);
TRACE_EVENT(ext4_da_reserve_space,
TP_PROTO(struct inode *inode, int md_needed),
TP_PROTO(struct inode *inode),
TP_ARGS(inode, md_needed),
TP_ARGS(inode),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
__field( __u64, i_blocks )
__field( int, md_needed )
__field( int, reserved_data_blocks )
__field( int, reserved_meta_blocks )
__field( __u16, mode )
@ -1203,18 +1202,17 @@ TRACE_EVENT(ext4_da_reserve_space,
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->i_blocks = inode->i_blocks;
__entry->md_needed = md_needed;
__entry->reserved_data_blocks = EXT4_I(inode)->i_reserved_data_blocks;
__entry->reserved_meta_blocks = EXT4_I(inode)->i_reserved_meta_blocks;
__entry->mode = inode->i_mode;
),
TP_printk("dev %d,%d ino %lu mode 0%o i_blocks %llu md_needed %d "
TP_printk("dev %d,%d ino %lu mode 0%o i_blocks %llu "
"reserved_data_blocks %d reserved_meta_blocks %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino,
__entry->mode, __entry->i_blocks,
__entry->md_needed, __entry->reserved_data_blocks,
__entry->reserved_data_blocks,
__entry->reserved_meta_blocks)
);