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authorLinus Torvalds <torvalds@linux-foundation.org>2016-01-13 04:11:47 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-13 04:11:47 +0300
commit33caf82acf4dc420bf0f0136b886f7b27ecf90c5 (patch)
treeb24b0b5c8f257ae7db3b8df939821a0856869895 /fs/xattr.c
parentca9706a282943899981e83604f2ed13e88ce4239 (diff)
parentbbddca8e8fac07ece3938e03526b5d00fa791a4c (diff)
downloadlinux-33caf82acf4dc420bf0f0136b886f7b27ecf90c5.tar.xz
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull misc vfs updates from Al Viro: "All kinds of stuff. That probably should've been 5 or 6 separate branches, but by the time I'd realized how large and mixed that bag had become it had been too close to -final to play with rebasing. Some fs/namei.c cleanups there, memdup_user_nul() introduction and switching open-coded instances, burying long-dead code, whack-a-mole of various kinds, several new helpers for ->llseek(), assorted cleanups and fixes from various people, etc. One piece probably deserves special mention - Neil's lookup_one_len_unlocked(). Similar to lookup_one_len(), but gets called without ->i_mutex and tries to avoid ever taking it. That, of course, means that it's not useful for any directory modifications, but things like getting inode attributes in nfds readdirplus are fine with that. I really should've asked for moratorium on lookup-related changes this cycle, but since I hadn't done that early enough... I *am* asking for that for the coming cycle, though - I'm going to try and get conversion of i_mutex to rwsem with ->lookup() done under lock taken shared. There will be a patch closer to the end of the window, along the lines of the one Linus had posted last May - mechanical conversion of ->i_mutex accesses to inode_lock()/inode_unlock()/inode_trylock()/ inode_is_locked()/inode_lock_nested(). To quote Linus back then: ----- | This is an automated patch using | | sed 's/mutex_lock(&\(.*\)->i_mutex)/inode_lock(\1)/' | sed 's/mutex_unlock(&\(.*\)->i_mutex)/inode_unlock(\1)/' | sed 's/mutex_lock_nested(&\(.*\)->i_mutex,[ ]*I_MUTEX_\([A-Z0-9_]*\))/inode_lock_nested(\1, I_MUTEX_\2)/' | sed 's/mutex_is_locked(&\(.*\)->i_mutex)/inode_is_locked(\1)/' | sed 's/mutex_trylock(&\(.*\)->i_mutex)/inode_trylock(\1)/' | | with a very few manual fixups ----- I'm going to send that once the ->i_mutex-affecting stuff in -next gets mostly merged (or when Linus says he's about to stop taking merges)" * 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (63 commits) nfsd: don't hold i_mutex over userspace upcalls fs:affs:Replace time_t with time64_t fs/9p: use fscache mutex rather than spinlock proc: add a reschedule point in proc_readfd_common() logfs: constify logfs_block_ops structures fcntl: allow to set O_DIRECT flag on pipe fs: __generic_file_splice_read retry lookup on AOP_TRUNCATED_PAGE fs: xattr: Use kvfree() [s390] page_to_phys() always returns a multiple of PAGE_SIZE nbd: use ->compat_ioctl() fs: use block_device name vsprintf helper lib/vsprintf: add %*pg format specifier fs: use gendisk->disk_name where possible poll: plug an unused argument to do_poll amdkfd: don't open-code memdup_user() cdrom: don't open-code memdup_user() rsxx: don't open-code memdup_user() mtip32xx: don't open-code memdup_user() [um] mconsole: don't open-code memdup_user_nul() [um] hostaudio: don't open-code memdup_user() ...
Diffstat (limited to 'fs/xattr.c')
-rw-r--r--fs/xattr.c38
1 files changed, 14 insertions, 24 deletions
diff --git a/fs/xattr.c b/fs/xattr.c
index d7f5037a17b5..d5dd6c8b82a7 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -305,7 +305,6 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
{
int error;
void *kvalue = NULL;
- void *vvalue = NULL; /* If non-NULL, we used vmalloc() */
char kname[XATTR_NAME_MAX + 1];
if (flags & ~(XATTR_CREATE|XATTR_REPLACE))
@@ -322,10 +321,9 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
return -E2BIG;
kvalue = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
if (!kvalue) {
- vvalue = vmalloc(size);
- if (!vvalue)
+ kvalue = vmalloc(size);
+ if (!kvalue)
return -ENOMEM;
- kvalue = vvalue;
}
if (copy_from_user(kvalue, value, size)) {
error = -EFAULT;
@@ -338,10 +336,8 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
error = vfs_setxattr(d, kname, kvalue, size, flags);
out:
- if (vvalue)
- vfree(vvalue);
- else
- kfree(kvalue);
+ kvfree(kvalue);
+
return error;
}
@@ -409,7 +405,6 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
{
ssize_t error;
void *kvalue = NULL;
- void *vvalue = NULL;
char kname[XATTR_NAME_MAX + 1];
error = strncpy_from_user(kname, name, sizeof(kname));
@@ -423,10 +418,9 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
size = XATTR_SIZE_MAX;
kvalue = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
if (!kvalue) {
- vvalue = vmalloc(size);
- if (!vvalue)
+ kvalue = vmalloc(size);
+ if (!kvalue)
return -ENOMEM;
- kvalue = vvalue;
}
}
@@ -442,10 +436,9 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
than XATTR_SIZE_MAX bytes. Not possible. */
error = -E2BIG;
}
- if (vvalue)
- vfree(vvalue);
- else
- kfree(kvalue);
+
+ kvfree(kvalue);
+
return error;
}
@@ -502,17 +495,15 @@ listxattr(struct dentry *d, char __user *list, size_t size)
{
ssize_t error;
char *klist = NULL;
- char *vlist = NULL; /* If non-NULL, we used vmalloc() */
if (size) {
if (size > XATTR_LIST_MAX)
size = XATTR_LIST_MAX;
klist = kmalloc(size, __GFP_NOWARN | GFP_KERNEL);
if (!klist) {
- vlist = vmalloc(size);
- if (!vlist)
+ klist = vmalloc(size);
+ if (!klist)
return -ENOMEM;
- klist = vlist;
}
}
@@ -525,10 +516,9 @@ listxattr(struct dentry *d, char __user *list, size_t size)
than XATTR_LIST_MAX bytes. Not possible. */
error = -E2BIG;
}
- if (vlist)
- vfree(vlist);
- else
- kfree(klist);
+
+ kvfree(klist);
+
return error;
}