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| author | Jiri Slaby <jslaby@suse.cz> | 2011-07-26 16:08:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-26 16:49:44 -0700 |
| commit | d40dcdb0172a1ba853464983a059fb45e0aaf61a (patch) | |
| tree | aa785c01ad6763c92191b86ec10f526fa772b808 | |
| parent | 04715206c0c2fd4ec5ca77fa51e3a5b41ce71492 (diff) | |
| download | linux-d40dcdb0172a1ba853464983a059fb45e0aaf61a.tar.bz2 | |
ipc/mqueue.c: fix mq_open() return value
We return ENOMEM from mqueue_get_inode even when we have enough memory.
Namely in case the system rlimit of mqueue was reached. This error
propagates to mq_queue and user sees the error unexpectedly. So fix
this up to properly return EMFILE as described in the manpage:
EMFILE The process already has the maximum number of files and
message queues open.
instead of:
ENOMEM Insufficient memory.
With the previous patch we just switch to ERR_PTR/PTR_ERR/IS_ERR error
handling here.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | ipc/mqueue.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c index d43c30f72f1d..ed049ea568f4 100644 --- a/ipc/mqueue.c +++ b/ipc/mqueue.c @@ -113,6 +113,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb, { struct user_struct *u = current_user(); struct inode *inode; + int ret = -ENOMEM; inode = new_inode(sb); if (!inode) @@ -160,6 +161,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb, u->mq_bytes + mq_bytes > task_rlimit(p, RLIMIT_MSGQUEUE)) { spin_unlock(&mq_lock); /* mqueue_evict_inode() releases info->messages */ + ret = -EMFILE; goto out_inode; } u->mq_bytes += mq_bytes; @@ -179,7 +181,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb, out_inode: iput(inode); err: - return NULL; + return ERR_PTR(ret); } static int mqueue_fill_super(struct super_block *sb, void *data, int silent) @@ -195,8 +197,8 @@ static int mqueue_fill_super(struct super_block *sb, void *data, int silent) inode = mqueue_get_inode(sb, ns, S_IFDIR | S_ISVTX | S_IRWXUGO, NULL); - if (!inode) { - error = -ENOMEM; + if (IS_ERR(inode)) { + error = PTR_ERR(inode); goto out; } @@ -316,8 +318,8 @@ static int mqueue_create(struct inode *dir, struct dentry *dentry, spin_unlock(&mq_lock); inode = mqueue_get_inode(dir->i_sb, ipc_ns, mode, attr); - if (!inode) { - error = -ENOMEM; + if (IS_ERR(inode)) { + error = PTR_ERR(inode); spin_lock(&mq_lock); ipc_ns->mq_queues_count--; goto out_unlock; |