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| author | Amir Goldstein <amir73il@gmail.com> | 2017-06-21 14:28:32 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2017-07-04 22:03:16 +0200 |
| commit | ad0af7104dadccd55cd2b390271677fac142650f (patch) | |
| tree | 1e377c42709b12efc4e01507143ebba09f389bc7 /include | |
| parent | ovl: move cache and version to ovl_inode (diff) | |
| download | linux-ad0af7104dadccd55cd2b390271677fac142650f.tar.xz linux-ad0af7104dadccd55cd2b390271677fac142650f.zip | |
vfs: introduce inode 'inuse' lock
Added an i_state flag I_INUSE and helpers to set/clear/test the bit.
The 'inuse' lock is an 'advisory' inode lock, that can be used to extend
exclusive create protection beyond parent->i_mutex lock among cooperating
users.
This is going to be used by overlayfs to get exclusive ownership on upper
and work dirs among overlayfs mounts.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fs.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 3e68cabb8457..75a5fafaf096 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1930,6 +1930,9 @@ static inline bool HAS_UNMAPPED_ID(struct inode *inode) * wb stat updates to grab mapping->tree_lock. See * inode_switch_wb_work_fn() for details. * + * I_OVL_INUSE Used by overlayfs to get exclusive ownership on upper + * and work dirs among overlayfs mounts. + * * Q: What is the difference between I_WILL_FREE and I_FREEING? */ #define I_DIRTY_SYNC (1 << 0) @@ -1950,6 +1953,7 @@ static inline bool HAS_UNMAPPED_ID(struct inode *inode) #define __I_DIRTY_TIME_EXPIRED 12 #define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED) #define I_WB_SWITCH (1 << 13) +#define I_OVL_INUSE (1 << 14) #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) |