btrfs: fallocate: Add support to accurate qgroup reserve

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Now fallocate will do accurate qgroup reserve space check, unlike old
method, which will always reserve the whole length of the range.

With this patch, fallocate will:
1) Iterate the desired range and mark in data rsv map
   Only range which is going to be allocated will be recorded in data
   rsv map and reserve the space.
   For already allocated range (normal/prealloc extent) they will be
   skipped.
   Also, record the marked range into a new list for later use.

2) If 1) succeeded, do real file extent allocate.
   And at file extent allocation time, corresponding range will be
   removed from the range in data rsv map.

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

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Qu Wenruo 2015-09-08 17:22:44 +08:00 • committed by Chris Mason

parent 81fb6f77a0

commit 14524a846e

1 changed files with 117 additions and 44 deletions

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fs/btrfs/file.c

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