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author | Alex Shi <alex.shi@linaro.org> | 2016-04-21 12:06:25 +0800 |
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committer | Alex Shi <alex.shi@linaro.org> | 2016-04-21 12:06:25 +0800 |
commit | 2bf7955152a0544342fcaed28930748cc68392ae (patch) | |
tree | d6900b5e4330d173b94fac3cbe2188eba2673771 /fs/ext4/ext4.h | |
parent | ad592b70ae97800d4f5bf535d45a680649e2789e (diff) | |
parent | 8c9aef03d3b540b6885e7534a885ea25f62dd9ed (diff) |
Merge tag 'v4.4.8' into linux-linaro-lsk-v4.4lsk-v4.4-16.04
This is the 4.4.8 stable release
Diffstat (limited to 'fs/ext4/ext4.h')
-rw-r--r-- | fs/ext4/ext4.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index cc7ca4e87144..d4156e1c128d 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -850,6 +850,29 @@ do { \ #include "extents_status.h" /* + * Lock subclasses for i_data_sem in the ext4_inode_info structure. + * + * These are needed to avoid lockdep false positives when we need to + * allocate blocks to the quota inode during ext4_map_blocks(), while + * holding i_data_sem for a normal (non-quota) inode. Since we don't + * do quota tracking for the quota inode, this avoids deadlock (as + * well as infinite recursion, since it isn't turtles all the way + * down...) + * + * I_DATA_SEM_NORMAL - Used for most inodes + * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode + * where the second inode has larger inode number + * than the first + * I_DATA_SEM_QUOTA - Used for quota inodes only + */ +enum { + I_DATA_SEM_NORMAL = 0, + I_DATA_SEM_OTHER, + I_DATA_SEM_QUOTA, +}; + + +/* * fourth extended file system inode data in memory */ struct ext4_inode_info { |