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author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-22 12:51:21 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-22 12:51:21 -0700 |
commit | 052b398a43a7de8c68c13e7fa05d6b3d16ce6801 (patch) | |
tree | 8b7ee72d0617daf55083bc9cbc904ee22cb953db /mm | |
parent | b953c0d234bc72e8489d3bf51a276c5c4ec85345 (diff) | |
parent | b853a16176cf3e02c57e215743015614152c2428 (diff) | |
download | linux-052b398a43a7de8c68c13e7fa05d6b3d16ce6801.tar.gz linux-052b398a43a7de8c68c13e7fa05d6b3d16ce6801.tar.bz2 linux-052b398a43a7de8c68c13e7fa05d6b3d16ce6801.zip |
Merge branch 'for-linus-1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs updates from Al Viro:
"In this pile: pathname resolution rewrite.
- recursion in link_path_walk() is gone.
- nesting limits on symlinks are gone (the only limit remaining is
that the total amount of symlinks is no more than 40, no matter how
nested).
- "fast" (inline) symlinks are handled without leaving rcuwalk mode.
- stack footprint (independent of the nesting) is below kilobyte now,
about on par with what it used to be with one level of nested
symlinks and ~2.8 times lower than it used to be in the worst case.
- struct nameidata is entirely private to fs/namei.c now (not even
opaque pointers are being passed around).
- ->follow_link() and ->put_link() calling conventions had been
changed; all in-tree filesystems converted, out-of-tree should be
able to follow reasonably easily.
For out-of-tree conversions, see Documentation/filesystems/porting
for details (and in-tree filesystems for examples of conversion).
That has sat in -next since mid-May, seems to survive all testing
without regressions and merges clean with v4.1"
* 'for-linus-1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (131 commits)
turn user_{path_at,path,lpath,path_dir}() into static inlines
namei: move saved_nd pointer into struct nameidata
inline user_path_create()
inline user_path_parent()
namei: trim do_last() arguments
namei: stash dfd and name into nameidata
namei: fold path_cleanup() into terminate_walk()
namei: saner calling conventions for filename_parentat()
namei: saner calling conventions for filename_create()
namei: shift nameidata down into filename_parentat()
namei: make filename_lookup() reject ERR_PTR() passed as name
namei: shift nameidata inside filename_lookup()
namei: move putname() call into filename_lookup()
namei: pass the struct path to store the result down into path_lookupat()
namei: uninline set_root{,_rcu}()
namei: be careful with mountpoint crossings in follow_dotdot_rcu()
Documentation: remove outdated information from automount-support.txt
get rid of assorted nameidata-related debris
lustre: kill unused helper
lustre: kill unused macro (LOOKUP_CONTINUE)
...
Diffstat (limited to 'mm')
-rw-r--r-- | mm/shmem.c | 32 |
1 files changed, 13 insertions, 19 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 47d536e59fc0..3759099d8ce4 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2451,6 +2451,7 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s return -ENOMEM; } inode->i_op = &shmem_short_symlink_operations; + inode->i_link = info->symlink; } else { error = shmem_getpage(inode, 0, &page, SGP_WRITE, NULL); if (error) { @@ -2474,30 +2475,23 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s return 0; } -static void *shmem_follow_short_symlink(struct dentry *dentry, struct nameidata *nd) -{ - nd_set_link(nd, SHMEM_I(d_inode(dentry))->symlink); - return NULL; -} - -static void *shmem_follow_link(struct dentry *dentry, struct nameidata *nd) +static const char *shmem_follow_link(struct dentry *dentry, void **cookie) { struct page *page = NULL; int error = shmem_getpage(d_inode(dentry), 0, &page, SGP_READ, NULL); - nd_set_link(nd, error ? ERR_PTR(error) : kmap(page)); - if (page) - unlock_page(page); - return page; + if (error) + return ERR_PTR(error); + unlock_page(page); + *cookie = page; + return kmap(page); } -static void shmem_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie) +static void shmem_put_link(struct inode *unused, void *cookie) { - if (!IS_ERR(nd_get_link(nd))) { - struct page *page = cookie; - kunmap(page); - mark_page_accessed(page); - page_cache_release(page); - } + struct page *page = cookie; + kunmap(page); + mark_page_accessed(page); + page_cache_release(page); } #ifdef CONFIG_TMPFS_XATTR @@ -2642,7 +2636,7 @@ static ssize_t shmem_listxattr(struct dentry *dentry, char *buffer, size_t size) static const struct inode_operations shmem_short_symlink_operations = { .readlink = generic_readlink, - .follow_link = shmem_follow_short_symlink, + .follow_link = simple_follow_link, #ifdef CONFIG_TMPFS_XATTR .setxattr = shmem_setxattr, .getxattr = shmem_getxattr, |