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authorPavel Emelyanov <xemul@openvz.org>2007-10-01 14:41:11 -0700
committerJ. Bruce Fields <bfields@citi.umich.edu>2007-10-09 18:32:46 -0400
commita16877ca9cec211708a161057a7cbfbf2cbc3a53 (patch)
treea114bfe588af58047b1eb2aa1f57ac4b890c01a6
parent98257af5a2ad0c5b502ebd07094d9fd8ce87acef (diff)
downloadop-kernel-dev-a16877ca9cec211708a161057a7cbfbf2cbc3a53.zip
op-kernel-dev-a16877ca9cec211708a161057a7cbfbf2cbc3a53.tar.gz
Cleanup macros for distinguishing mandatory locks
The combination of S_ISGID bit set and S_IXGRP bit unset is used to mark the inode as "mandatory lockable" and there's a macro for this check called MANDATORY_LOCK(inode). However, fs/locks.c and some filesystems still perform the explicit i_mode checking. Besides, Andrew pointed out, that this macro is buggy itself, as it dereferences the inode arg twice. Convert this macro into static inline function and switch its users to it, making the code shorter and more readable. The __mandatory_lock() helper is to be used in places where the IS_MANDLOCK() for superblock is already known to be true. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: David Howells <dhowells@redhat.com> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@sandia.gov> Cc: Latchesar Ionkov <lucho@ionkov.net> Cc: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--fs/locks.c14
-rw-r--r--fs/nfsd/nfs4state.c2
-rw-r--r--fs/nfsd/vfs.c2
-rw-r--r--fs/read_write.c2
-rw-r--r--include/linux/fs.h21
5 files changed, 24 insertions, 17 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 43dbc7f..9a3fe0d 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1119,7 +1119,7 @@ int locks_mandatory_area(int read_write, struct inode *inode,
* If we've been sleeping someone might have
* changed the permissions behind our back.
*/
- if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
+ if (__mandatory_lock(inode))
continue;
}
@@ -1761,9 +1761,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
/* Don't allow mandatory locks on files that may be memory mapped
* and shared.
*/
- if (IS_MANDLOCK(inode) &&
- (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID &&
- mapping_writably_mapped(filp->f_mapping)) {
+ if (mandatory_lock(inode) && mapping_writably_mapped(filp->f_mapping)) {
error = -EAGAIN;
goto out;
}
@@ -1887,9 +1885,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
/* Don't allow mandatory locks on files that may be memory mapped
* and shared.
*/
- if (IS_MANDLOCK(inode) &&
- (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID &&
- mapping_writably_mapped(filp->f_mapping)) {
+ if (mandatory_lock(inode) && mapping_writably_mapped(filp->f_mapping)) {
error = -EAGAIN;
goto out;
}
@@ -2083,9 +2079,7 @@ static void lock_get_status(char* out, struct file_lock *fl, int id, char *pfx)
out += sprintf(out, "%6s %s ",
(fl->fl_flags & FL_ACCESS) ? "ACCESS" : "POSIX ",
(inode == NULL) ? "*NOINODE*" :
- (IS_MANDLOCK(inode) &&
- (inode->i_mode & (S_IXGRP | S_ISGID)) == S_ISGID) ?
- "MANDATORY" : "ADVISORY ");
+ mandatory_lock(inode) ? "MANDATORY" : "ADVISORY ");
} else if (IS_FLOCK(fl)) {
if (fl->fl_type & LOCK_MAND) {
out += sprintf(out, "FLOCK MSNFS ");
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 3f55970..3c028b9 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2044,7 +2044,7 @@ static inline int
io_during_grace_disallowed(struct inode *inode, int flags)
{
return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
- && MANDATORY_LOCK(inode);
+ && mandatory_lock(inode);
}
/*
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 7867151..9152f87 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -65,7 +65,7 @@
* locks on them because there is no way to know if the accesser has
* the lock.
*/
-#define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i))
+#define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && mandatory_lock(i))
/*
* This is a cache of readahead params that help us choose the proper
diff --git a/fs/read_write.c b/fs/read_write.c
index 507ddff..124693e 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -205,7 +205,7 @@ int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count
if (unlikely((pos < 0) || (loff_t) (pos + count) < 0))
goto Einval;
- if (unlikely(inode->i_flock && MANDATORY_LOCK(inode))) {
+ if (unlikely(inode->i_flock && mandatory_lock(inode))) {
int retval = locks_mandatory_area(
read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE,
inode, file, pos, count);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 16421f6..f5075e0 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1369,12 +1369,25 @@ 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;
}
@@ -1385,7 +1398,7 @@ 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,
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