ocfs2: update truncate handling of partial clusters
The partial cluster zeroing code used during truncate usually assumes that the rightmost byte in the range to be zeroed lies on a cluster boundary. This makes sense for truncate, but punching holes might require zeroing on non-aligned rightmost boundaries. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh
Родитель
d0c7d7082e
Коммит
35edec1d52
|
|
@ -5668,9 +5668,9 @@ static int ocfs2_ordered_zero_func(handle_t *handle, struct buffer_head *bh)
|
|||
return ocfs2_journal_dirty_data(handle, bh);
|
||||
}
|
||||
|
||||
static void ocfs2_zero_cluster_pages(struct inode *inode, loff_t isize,
|
||||
struct page **pages, int numpages,
|
||||
u64 phys, handle_t *handle)
|
||||
static void ocfs2_zero_cluster_pages(struct inode *inode, loff_t start,
|
||||
loff_t end, struct page **pages,
|
||||
int numpages, u64 phys, handle_t *handle)
|
||||
{
|
||||
int i, ret, partial = 0;
|
||||
void *kaddr;
|
||||
|
|
@ -5683,26 +5683,14 @@ static void ocfs2_zero_cluster_pages(struct inode *inode, loff_t isize,
|
|||
if (numpages == 0)
|
||||
goto out;
|
||||
|
||||
from = isize & (PAGE_CACHE_SIZE - 1); /* 1st page offset */
|
||||
if (PAGE_CACHE_SHIFT > OCFS2_SB(sb)->s_clustersize_bits) {
|
||||
/*
|
||||
* Since 'from' has been capped to a value below page
|
||||
* size, this calculation won't be able to overflow
|
||||
* 'to'
|
||||
*/
|
||||
to = ocfs2_align_bytes_to_clusters(sb, from);
|
||||
|
||||
/*
|
||||
* The truncate tail in this case should never contain
|
||||
* more than one page at maximum. The loop below also
|
||||
* assumes this.
|
||||
*/
|
||||
BUG_ON(numpages != 1);
|
||||
}
|
||||
|
||||
to = PAGE_CACHE_SIZE;
|
||||
for(i = 0; i < numpages; i++) {
|
||||
page = pages[i];
|
||||
|
||||
from = start & (PAGE_CACHE_SIZE - 1);
|
||||
if ((end >> PAGE_CACHE_SHIFT) == page->index)
|
||||
to = end & (PAGE_CACHE_SIZE - 1);
|
||||
|
||||
BUG_ON(from > PAGE_CACHE_SIZE);
|
||||
BUG_ON(to > PAGE_CACHE_SIZE);
|
||||
|
||||
|
|
@ -5739,10 +5727,7 @@ static void ocfs2_zero_cluster_pages(struct inode *inode, loff_t isize,
|
|||
|
||||
flush_dcache_page(page);
|
||||
|
||||
/*
|
||||
* Every page after the 1st one should be completely zero'd.
|
||||
*/
|
||||
from = 0;
|
||||
start = (page->index + 1) << PAGE_CACHE_SHIFT;
|
||||
}
|
||||
out:
|
||||
if (pages) {
|
||||
|
|
@ -5755,24 +5740,26 @@ out:
|
|||
}
|
||||
}
|
||||
|
||||
static int ocfs2_grab_eof_pages(struct inode *inode, loff_t isize, struct page **pages,
|
||||
int *num, u64 *phys)
|
||||
static int ocfs2_grab_eof_pages(struct inode *inode, loff_t start, loff_t end,
|
||||
struct page **pages, int *num, u64 *phys)
|
||||
{
|
||||
int i, numpages = 0, ret = 0;
|
||||
unsigned int csize = OCFS2_SB(inode->i_sb)->s_clustersize;
|
||||
unsigned int ext_flags;
|
||||
struct super_block *sb = inode->i_sb;
|
||||
struct address_space *mapping = inode->i_mapping;
|
||||
unsigned long index;
|
||||
u64 next_cluster_bytes;
|
||||
loff_t last_page_bytes;
|
||||
|
||||
BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(sb)));
|
||||
BUG_ON(start > end);
|
||||
|
||||
/* Cluster boundary, so we don't need to grab any pages. */
|
||||
if ((isize & (csize - 1)) == 0)
|
||||
if (start == end)
|
||||
goto out;
|
||||
|
||||
ret = ocfs2_extent_map_get_blocks(inode, isize >> sb->s_blocksize_bits,
|
||||
BUG_ON(start >> OCFS2_SB(sb)->s_clustersize_bits !=
|
||||
(end - 1) >> OCFS2_SB(sb)->s_clustersize_bits);
|
||||
|
||||
ret = ocfs2_extent_map_get_blocks(inode, start >> sb->s_blocksize_bits,
|
||||
phys, NULL, &ext_flags);
|
||||
if (ret) {
|
||||
mlog_errno(ret);
|
||||
|
|
@ -5788,8 +5775,8 @@ static int ocfs2_grab_eof_pages(struct inode *inode, loff_t isize, struct page *
|
|||
if (ext_flags & OCFS2_EXT_UNWRITTEN)
|
||||
goto out;
|
||||
|
||||
next_cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, isize);
|
||||
index = isize >> PAGE_CACHE_SHIFT;
|
||||
last_page_bytes = PAGE_ALIGN(end);
|
||||
index = start >> PAGE_CACHE_SHIFT;
|
||||
do {
|
||||
pages[numpages] = grab_cache_page(mapping, index);
|
||||
if (!pages[numpages]) {
|
||||
|
|
@ -5800,7 +5787,7 @@ static int ocfs2_grab_eof_pages(struct inode *inode, loff_t isize, struct page *
|
|||
|
||||
numpages++;
|
||||
index++;
|
||||
} while (index < (next_cluster_bytes >> PAGE_CACHE_SHIFT));
|
||||
} while (index < (last_page_bytes >> PAGE_CACHE_SHIFT));
|
||||
|
||||
out:
|
||||
if (ret != 0) {
|
||||
|
|
@ -5829,11 +5816,10 @@ out:
|
|||
* otherwise block_write_full_page() will skip writeout of pages past
|
||||
* i_size. The new_i_size parameter is passed for this reason.
|
||||
*/
|
||||
int ocfs2_zero_tail_for_truncate(struct inode *inode, handle_t *handle,
|
||||
u64 new_i_size)
|
||||
int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle,
|
||||
u64 range_start, u64 range_end)
|
||||
{
|
||||
int ret, numpages;
|
||||
loff_t endbyte;
|
||||
struct page **pages = NULL;
|
||||
u64 phys;
|
||||
|
||||
|
|
@ -5852,7 +5838,8 @@ int ocfs2_zero_tail_for_truncate(struct inode *inode, handle_t *handle,
|
|||
goto out;
|
||||
}
|
||||
|
||||
ret = ocfs2_grab_eof_pages(inode, new_i_size, pages, &numpages, &phys);
|
||||
ret = ocfs2_grab_eof_pages(inode, range_start, range_end, pages,
|
||||
&numpages, &phys);
|
||||
if (ret) {
|
||||
mlog_errno(ret);
|
||||
goto out;
|
||||
|
|
@ -5861,17 +5848,16 @@ int ocfs2_zero_tail_for_truncate(struct inode *inode, handle_t *handle,
|
|||
if (numpages == 0)
|
||||
goto out;
|
||||
|
||||
ocfs2_zero_cluster_pages(inode, new_i_size, pages, numpages, phys,
|
||||
handle);
|
||||
ocfs2_zero_cluster_pages(inode, range_start, range_end, pages,
|
||||
numpages, phys, handle);
|
||||
|
||||
/*
|
||||
* Initiate writeout of the pages we zero'd here. We don't
|
||||
* wait on them - the truncate_inode_pages() call later will
|
||||
* do that for us.
|
||||
*/
|
||||
endbyte = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
|
||||
ret = do_sync_mapping_range(inode->i_mapping, new_i_size,
|
||||
endbyte - 1, SYNC_FILE_RANGE_WRITE);
|
||||
ret = do_sync_mapping_range(inode->i_mapping, range_start,
|
||||
range_end - 1, SYNC_FILE_RANGE_WRITE);
|
||||
if (ret)
|
||||
mlog_errno(ret);
|
||||
|
||||
|
|
|
|||
|
|
@ -95,8 +95,8 @@ struct ocfs2_truncate_context {
|
|||
struct buffer_head *tc_last_eb_bh;
|
||||
};
|
||||
|
||||
int ocfs2_zero_tail_for_truncate(struct inode *inode, handle_t *handle,
|
||||
u64 new_i_size);
|
||||
int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle,
|
||||
u64 range_start, u64 range_end);
|
||||
int ocfs2_prepare_truncate(struct ocfs2_super *osb,
|
||||
struct inode *inode,
|
||||
struct buffer_head *fe_bh,
|
||||
|
|
|
|||
|
|
@ -263,6 +263,7 @@ static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
|
|||
int status;
|
||||
handle_t *handle;
|
||||
struct ocfs2_dinode *di;
|
||||
u64 cluster_bytes;
|
||||
|
||||
mlog_entry_void();
|
||||
|
||||
|
|
@ -286,7 +287,9 @@ static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
|
|||
/*
|
||||
* Do this before setting i_size.
|
||||
*/
|
||||
status = ocfs2_zero_tail_for_truncate(inode, handle, new_i_size);
|
||||
cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
|
||||
status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
|
||||
cluster_bytes);
|
||||
if (status) {
|
||||
mlog_errno(status);
|
||||
goto out_commit;
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче