Btrfs: prevent list corruption during free space cache processing

Browse source

__btrfs_write_out_cache is holding the ctl->tree_lock while it prepares
a list of bitmaps to record in the free space cache.  It was dropping
the lock while it worked on other components, which made a window for
free_bitmap() to free the bitmap struct without removing it from the
list.

This changes things to hold the lock the whole time, and also makes sure
we hold the lock during enospc cleanup.

Reported-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

...

This commit is contained in:

Chris Mason 2015-04-24 11:00:00 -07:00

parent 85db36cfb3

commit a3bdccc4e6

1 changed files with 18 additions and 14 deletions

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

Download patch file Download diff file Expand all files Collapse all files

32

fs/btrfs/free-space-cache.c

View file