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fs/namespace: convert devname allocation to kstrdup_const

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VFS frequently performs duplication of strings located in read-only memory
section.  Replacing kstrdup by kstrdup_const allows to avoid such
operations.

Signed-off-by: Andrzej Hajda <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Cc: Kyungmin Park <[email protected]>
Cc: Mike Turquette <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Greg KH <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrzej Hajda 2015-02-13 14:36:41 -08:00 • committed by Linus Torvalds
commit fcc139ae22
1 changed files with 3 additions and 3 deletions
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6
fs/namespace.c
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@ -201,7 +201,7 @@ static struct mount *alloc_vfsmnt(const char *name)
goto out_free_cache;
if (name) {
mnt->mnt_devname = kstrdup(name, GFP_KERNEL);
mnt->mnt_devname = kstrdup_const(name, GFP_KERNEL);
if (!mnt->mnt_devname)
goto out_free_id;
}
@ -234,7 +234,7 @@ static struct mount *alloc_vfsmnt(const char *name)
#ifdef CONFIG_SMP
out_free_devname:
kfree(mnt->mnt_devname);
kfree_const(mnt->mnt_devname);
#endif
out_free_id:
mnt_free_id(mnt);
@ -568,7 +568,7 @@ int sb_prepare_remount_readonly(struct super_block *sb)
static void free_vfsmnt(struct mount *mnt)
{
kfree(mnt->mnt_devname);
kfree_const(mnt->mnt_devname);
#ifdef CONFIG_SMP
free_percpu(mnt->mnt_pcp);
#endif