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f2fs: fix to update last i_size if fallocate partially succeeds 

In the case of expanding pinned file, map.m_lblk and map.m_len
will update in each round of section allocation, so in error
path, last i_size will be calculated with wrong m_lblk and m_len,
fix it.

Fixes: f5a53edcf0 ("f2fs: support aligned pinned file")
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2021-03-24 11:24:33 +08:00 committed by Jaegeuk Kim
parent 3fd9735908
commit 88f2cfc5fa
1 changed files with 11 additions and 11 deletions
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22
fs/f2fs/file.c
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@ -1619,9 +1619,10 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
struct f2fs_map_blocks map = { .m_next_pgofs = NULL,
.m_next_extent = NULL, .m_seg_type = NO_CHECK_TYPE,
.m_may_create = true };
pgoff_t pg_end;
pgoff_t pg_start, pg_end;
loff_t new_size = i_size_read(inode);
loff_t off_end;
block_t expanded = 0;
int err;
err = inode_newsize_ok(inode, (len + offset));
@ -1634,11 +1635,12 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
f2fs_balance_fs(sbi, true);
pg_start = ((unsigned long long)offset) >> PAGE_SHIFT;
pg_end = ((unsigned long long)offset + len) >> PAGE_SHIFT;
off_end = (offset + len) & (PAGE_SIZE - 1);
map.m_lblk = ((unsigned long long)offset) >> PAGE_SHIFT;
map.m_len = pg_end - map.m_lblk;
map.m_lblk = pg_start;
map.m_len = pg_end - pg_start;
if (off_end)
map.m_len++;
@ -1648,7 +1650,6 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
if (f2fs_is_pinned_file(inode)) {
block_t sec_blks = BLKS_PER_SEC(sbi);
block_t sec_len = roundup(map.m_len, sec_blks);
block_t done = 0;
map.m_len = sec_blks;
next_alloc:
@ -1656,10 +1657,8 @@ next_alloc:
GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)))) {
down_write(&sbi->gc_lock);
err = f2fs_gc(sbi, true, false, false, NULL_SEGNO);
if (err && err != -ENODATA && err != -EAGAIN) {
map.m_len = done;
if (err && err != -ENODATA && err != -EAGAIN)
goto out_err;
}
}
down_write(&sbi->pin_sem);
@ -1673,24 +1672,25 @@ next_alloc:
up_write(&sbi->pin_sem);
done += map.m_len;
expanded += map.m_len;
sec_len -= map.m_len;
map.m_lblk += map.m_len;
if (!err && sec_len)
goto next_alloc;
map.m_len = done;
map.m_len = expanded;
} else {
err = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO);
expanded = map.m_len;
}
out_err:
if (err) {
pgoff_t last_off;
if (!map.m_len)
if (!expanded)
return err;
last_off = map.m_lblk + map.m_len - 1;
last_off = pg_start + expanded - 1;
/* update new size to the failed position */
new_size = (last_off == pg_end) ? offset + len :