btrfs: Avoid trucating page or punching hole in a already existed hole.

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btrfs_punch_hole() will truncate unaligned pages or punch hole on a
already existed hole.
This will cause unneeded zero page or holes splitting the original huge
hole.

This patch will skip already existed holes before any page truncating or
hole punching.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

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This commit is contained in:

Qu Wenruo 2014-05-30 15:16:10 +08:00 • committed by Chris Mason

parent 3821f34888

commit d77815461f

1 changed files with 98 additions and 14 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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112

fs/btrfs/file.c

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