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f2fs: drop largest extent by range

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now we update extent by range, fofs may not be on the largest
extent if the new extent overlaps with it. so add a new function
to drop largest extent properly.

Signed-off-by: Fan li <fanofcode.li@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Fan Li 2015-09-17 18:24:17 +08:00 committed by Jaegeuk Kim
parent a7230d16d5
commit 41a099de3a
1 changed files with 5 additions and 4 deletions
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9
fs/f2fs/extent_cache.c
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@ -155,11 +155,12 @@ static unsigned int __free_extent_tree(struct f2fs_sb_info *sbi,
return count - et->count;
}
static void __drop_largest_extent(struct inode *inode, pgoff_t fofs)
static void __drop_largest_extent(struct inode *inode,
pgoff_t fofs, unsigned int len)
{
struct extent_info *largest = &F2FS_I(inode)->extent_tree->largest;
if (largest->fofs <= fofs && largest->fofs + largest->len > fofs)
if (fofs < largest->fofs + largest->len && fofs + len > largest->fofs)
largest->len = 0;
}
@ -168,7 +169,7 @@ void f2fs_drop_largest_extent(struct inode *inode, pgoff_t fofs)
if (!f2fs_may_extent_tree(inode))
return;
__drop_largest_extent(inode, fofs);
__drop_largest_extent(inode, fofs, 1);
}
void f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext)
@ -422,7 +423,7 @@ static unsigned int f2fs_update_extent_tree_range(struct inode *inode,
dei.len = 0;
/* we do not guarantee that the largest extent is cached all the time */
__drop_largest_extent(inode, fofs);
__drop_largest_extent(inode, fofs, len);
/* 1. lookup first extent node in range [fofs, fofs + len - 1] */
en = __lookup_extent_tree_ret(et, fofs, &prev_en, &next_en,