diff options
| author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-15 16:07:40 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-15 16:07:40 -0700 |
| commit | 541010e4b8921cd781ff02ae68028501457045b6 (patch) | |
| tree | 58bd529d4c6e69899a0aa20afa2d7f1c23326417 /include/linux/fs.h | |
| parent | e457f790d8b05977853aa238bbc667b3bb375671 (diff) | |
| parent | 5e7fc436426b1f9e106f511a049de91c82ec2c53 (diff) | |
Merge branch 'locks' of git://linux-nfs.org/~bfields/linux
* 'locks' of git://linux-nfs.org/~bfields/linux:
nfsd: remove IS_ISMNDLCK macro
Rework /proc/locks via seq_files and seq_list helpers
fs/locks.c: use list_for_each_entry() instead of list_for_each()
NFS: clean up explicit check for mandatory locks
AFS: clean up explicit check for mandatory locks
9PFS: clean up explicit check for mandatory locks
GFS2: clean up explicit check for mandatory locks
Cleanup macros for distinguishing mandatory locks
Documentation: move locks.txt in filesystems/
locks: add warning about mandatory locking races
Documentation: move mandatory locking documentation to filesystems/
locks: Fix potential OOPS in generic_setlease()
Use list_first_entry in locks_wake_up_blocks
locks: fix flock_lock_file() comment
Memory shortage can result in inconsistent flocks state
locks: kill redundant local variable
locks: reverse order of posix_locks_conflict() arguments
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 6d760f1ad875..4a6a21077bae 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -883,6 +883,7 @@ extern int vfs_setlease(struct file *, long, struct file_lock **); extern int lease_modify(struct file_lock **, int); extern int lock_may_read(struct inode *, loff_t start, unsigned long count); extern int lock_may_write(struct inode *, loff_t start, unsigned long count); +extern struct seq_operations locks_seq_operations; struct fasync_struct { int magic; @@ -1375,12 +1376,25 @@ extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size * Candidates for mandatory locking have the setgid bit set * but no group execute bit - an otherwise meaningless combination. */ -#define MANDATORY_LOCK(inode) \ - (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) + +static inline int __mandatory_lock(struct inode *ino) +{ + return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; +} + +/* + * ... and these candidates should be on MS_MANDLOCK mounted fs, + * otherwise these will be advisory locks + */ + +static inline int mandatory_lock(struct inode *ino) +{ + return IS_MANDLOCK(ino) && __mandatory_lock(ino); +} static inline int locks_verify_locked(struct inode *inode) { - if (MANDATORY_LOCK(inode)) + if (mandatory_lock(inode)) return locks_mandatory_locked(inode); return 0; } @@ -1391,7 +1405,7 @@ static inline int locks_verify_truncate(struct inode *inode, struct file *filp, loff_t size) { - if (inode->i_flock && MANDATORY_LOCK(inode)) + if (inode->i_flock && mandatory_lock(inode)) return locks_mandatory_area( FLOCK_VERIFY_WRITE, inode, filp, size < inode->i_size ? size : inode->i_size, |