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author | Ingo Molnar <mingo@kernel.org> | 2017-03-01 11:02:26 +0300 |
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committer | Ingo Molnar <mingo@kernel.org> | 2017-03-01 11:02:26 +0300 |
commit | 0871d5a66da5c41151e0896a90298b163e42f2e0 (patch) | |
tree | 1ba71fab9016cb28bb9d18ffd62b6b744f2f761c /fs/ext4/xattr.h | |
parent | e22af0be2cf654bb225f19750c6b9aab1627dc9e (diff) | |
parent | 2d6be4abf514fc26c83d239c7f31da1f95e4a31d (diff) | |
download | linux-0871d5a66da5c41151e0896a90298b163e42f2e0.tar.xz |
Merge branch 'linus' into WIP.x86/boot, to fix up conflicts and to pick up updates
Conflicts:
arch/x86/xen/setup.c
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'fs/ext4/xattr.h')
-rw-r--r-- | fs/ext4/xattr.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h index a92e783fa057..099c8b670ef5 100644 --- a/fs/ext4/xattr.h +++ b/fs/ext4/xattr.h @@ -102,6 +102,38 @@ extern const struct xattr_handler ext4_xattr_security_handler; #define EXT4_XATTR_NAME_ENCRYPTION_CONTEXT "c" +/* + * The EXT4_STATE_NO_EXPAND is overloaded and used for two purposes. + * The first is to signal that there the inline xattrs and data are + * taking up so much space that we might as well not keep trying to + * expand it. The second is that xattr_sem is taken for writing, so + * we shouldn't try to recurse into the inode expansion. For this + * second case, we need to make sure that we take save and restore the + * NO_EXPAND state flag appropriately. + */ +static inline void ext4_write_lock_xattr(struct inode *inode, int *save) +{ + down_write(&EXT4_I(inode)->xattr_sem); + *save = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); + ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); +} + +static inline int ext4_write_trylock_xattr(struct inode *inode, int *save) +{ + if (down_write_trylock(&EXT4_I(inode)->xattr_sem) == 0) + return 0; + *save = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); + ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); + return 1; +} + +static inline void ext4_write_unlock_xattr(struct inode *inode, int *save) +{ + if (*save == 0) + ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); + up_write(&EXT4_I(inode)->xattr_sem); +} + extern ssize_t ext4_listxattr(struct dentry *, char *, size_t); extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t); |