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namei: get rid of nameidata->base 

we can do fdput() under rcu_read_lock() just fine; all we need to take
care of is fetching nd->inode value first.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-05-11 08:05:05 -04:00
parent 8bcb77fabd
commit 34a26b99b7
1 changed files with 5 additions and 8 deletions
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13
fs/namei.c
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@ -503,7 +503,6 @@ struct nameidata {
int last_type;
unsigned depth;
int total_link_count;
struct file *base;
struct saved {
struct path link;
void *cookie;
@ -1872,7 +1871,6 @@ static int path_init(int dfd, const struct filename *name, unsigned int flags,
nd->last_type = LAST_ROOT; /* if there are only slashes... */
nd->flags = flags | LOOKUP_JUMPED | LOOKUP_PARENT;
nd->depth = 0;
nd->base = NULL;
if (flags & LOOKUP_ROOT) {
struct dentry *root = nd->root.dentry;
struct inode *inode = root->d_inode;
@ -1941,14 +1939,15 @@ static int path_init(int dfd, const struct filename *name, unsigned int flags,
nd->path = f.file->f_path;
if (flags & LOOKUP_RCU) {
if (f.flags & FDPUT_FPUT)
nd->base = f.file;
nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
rcu_read_lock();
nd->inode = nd->path.dentry->d_inode;
nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
} else {
path_get(&nd->path);
fdput(f);
nd->inode = nd->path.dentry->d_inode;
}
fdput(f);
goto done;
}
nd->inode = nd->path.dentry->d_inode;
@ -1971,8 +1970,6 @@ static void path_cleanup(struct nameidata *nd)
path_put(&nd->root);
nd->root.mnt = NULL;
}
if (unlikely(nd->base))
fput(nd->base);
}
static int trailing_symlink(struct nameidata *nd)