From: <viro@parcelfarce.linux.theplanet.co.uk>
tmpfs switched (it almost belongs to SL3, but it does some extra stuff after
the link traversal).
---
25-akpm/mm/shmem.c | 46 ++++++++++++++++++++--------------------------
1 files changed, 20 insertions(+), 26 deletions(-)
diff -puN mm/shmem.c~SL6-shm-RC6-bk5 mm/shmem.c
--- 25/mm/shmem.c~SL6-shm-RC6-bk5 2004-05-23 01:42:37.098036120 -0700
+++ 25-akpm/mm/shmem.c 2004-05-23 01:42:37.105035056 -0700
@@ -1676,51 +1676,45 @@ static int shmem_symlink(struct inode *d
return 0;
}
-static int shmem_readlink_inline(struct dentry *dentry, char __user *buffer, int buflen)
-{
- return vfs_readlink(dentry, buffer, buflen, (const char *)SHMEM_I(dentry->d_inode));
-}
-
static int shmem_follow_link_inline(struct dentry *dentry, struct nameidata *nd)
{
- return vfs_follow_link(nd, (const char *)SHMEM_I(dentry->d_inode));
+ nd_set_link(nd, (char *)SHMEM_I(dentry->d_inode));
+ return 0;
}
-static int shmem_readlink(struct dentry *dentry, char __user *buffer, int buflen)
+static int shmem_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct page *page = NULL;
int res = shmem_getpage(dentry->d_inode, 0, &page, SGP_READ, NULL);
- if (res)
- return res;
- res = vfs_readlink(dentry, buffer, buflen, kmap(page));
- kunmap(page);
- mark_page_accessed(page);
- page_cache_release(page);
- return res;
+ nd_set_link(nd, res ? ERR_PTR(res) : kmap(page));
+ return 0;
}
-static int shmem_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void shmem_put_link(struct dentry *dentry, struct nameidata *nd)
{
- struct page *page = NULL;
- int res = shmem_getpage(dentry->d_inode, 0, &page, SGP_READ, NULL);
- if (res)
- return res;
- res = vfs_follow_link(nd, kmap(page));
- kunmap(page);
- mark_page_accessed(page);
- page_cache_release(page);
- return res;
+ if (!IS_ERR(nd_get_link(nd))) {
+ struct page *page;
+
+ page = find_get_page(dentry->d_inode->i_mapping, 0);
+ if (!page)
+ BUG();
+ kunmap(page);
+ mark_page_accessed(page);
+ page_cache_release(page);
+ page_cache_release(page);
+ }
}
static struct inode_operations shmem_symlink_inline_operations = {
- .readlink = shmem_readlink_inline,
+ .readlink = generic_readlink,
.follow_link = shmem_follow_link_inline,
};
static struct inode_operations shmem_symlink_inode_operations = {
.truncate = shmem_truncate,
- .readlink = shmem_readlink,
+ .readlink = generic_readlink,
.follow_link = shmem_follow_link,
+ .put_link = shmem_put_link,
};
static int shmem_parse_options(char *options, int *mode, uid_t *uid, gid_t *gid, unsigned long *blocks, unsigned long *inodes)
_