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vfs: add d_is_dir()

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Add d_is_dir(dentry) helper which is analogous to S_ISDIR().

To avoid confusion, rename d_is_directory() to d_can_lookup().

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Miklos Szeredi 2014-04-01 17:08:41 +02:00
parent 455c6fdbd2
commit 44b1d53043
2 changed files with 17 additions and 13 deletions
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23
fs/namei.c
View File

@ -1796,7 +1796,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
if (err)
return err;
}
if (!d_is_directory(nd->path.dentry)) {
if (!d_can_lookup(nd->path.dentry)) {
err = -ENOTDIR;
break;
}
@ -1817,7 +1817,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
struct dentry *root = nd->root.dentry;
struct inode *inode = root->d_inode;
if (*name) {
if (!d_is_directory(root))
if (!d_can_lookup(root))
return -ENOTDIR;
retval = inode_permission(inode, MAY_EXEC);
if (retval)
@ -1873,7 +1873,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
dentry = f.file->f_path.dentry;
if (*name) {
if (!d_is_directory(dentry)) {
if (!d_can_lookup(dentry)) {
fdput(f);
return -ENOTDIR;
}
@ -1955,7 +1955,7 @@ static int path_lookupat(int dfd, const char *name,
err = complete_walk(nd);
if (!err && nd->flags & LOOKUP_DIRECTORY) {
if (!d_is_directory(nd->path.dentry)) {
if (!d_can_lookup(nd->path.dentry)) {
path_put(&nd->path);
err = -ENOTDIR;
}
@ -2414,11 +2414,11 @@ static int may_delete(struct inode *dir, struct dentry *victim, bool isdir)
IS_IMMUTABLE(inode) || IS_SWAPFILE(inode))
return -EPERM;
if (isdir) {
if (!d_is_directory(victim) && !d_is_autodir(victim))
if (!d_is_dir(victim))
return -ENOTDIR;
if (IS_ROOT(victim))
return -EBUSY;
} else if (d_is_directory(victim) || d_is_autodir(victim))
} else if (d_is_dir(victim))
return -EISDIR;
if (IS_DEADDIR(dir))
return -ENOENT;
@ -3016,11 +3016,10 @@ static int do_last(struct nameidata *nd, struct path *path,
}
audit_inode(name, nd->path.dentry, 0);
error = -EISDIR;
if ((open_flag & O_CREAT) &&
(d_is_directory(nd->path.dentry) || d_is_autodir(nd->path.dentry)))
if ((open_flag & O_CREAT) && d_is_dir(nd->path.dentry))
goto out;
error = -ENOTDIR;
if ((nd->flags & LOOKUP_DIRECTORY) && !d_is_directory(nd->path.dentry))
if ((nd->flags & LOOKUP_DIRECTORY) && !d_can_lookup(nd->path.dentry))
goto out;
if (!S_ISREG(nd->inode->i_mode))
will_truncate = false;
@ -3744,7 +3743,7 @@ static long do_unlinkat(int dfd, const char __user *pathname)
slashes:
if (d_is_negative(dentry))
error = -ENOENT;
else if (d_is_directory(dentry) || d_is_autodir(dentry))
else if (d_is_dir(dentry))
error = -EISDIR;
else
error = -ENOTDIR;
@ -4123,7 +4122,7 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode **delegated_inode)
{
int error;
int is_dir = d_is_directory(old_dentry) || d_is_autodir(old_dentry);
int is_dir = d_is_dir(old_dentry);
const unsigned char *old_name;
if (old_dentry->d_inode == new_dentry->d_inode)
@ -4216,7 +4215,7 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
if (d_is_negative(old_dentry))
goto exit4;
/* unless the source is a directory trailing slashes give -ENOTDIR */
if (!d_is_directory(old_dentry) && !d_is_autodir(old_dentry)) {
if (!d_is_dir(old_dentry)) {
error = -ENOTDIR;
if (oldnd.last.name[oldnd.last.len])
goto exit4;

7
include/linux/dcache.h
View File

@ -429,7 +429,7 @@ static inline unsigned __d_entry_type(const struct dentry *dentry)
return dentry->d_flags & DCACHE_ENTRY_TYPE;
}
static inline bool d_is_directory(const struct dentry *dentry)
static inline bool d_can_lookup(const struct dentry *dentry)
{
return __d_entry_type(dentry) == DCACHE_DIRECTORY_TYPE;
}
@ -439,6 +439,11 @@ static inline bool d_is_autodir(const struct dentry *dentry)
return __d_entry_type(dentry) == DCACHE_AUTODIR_TYPE;
}
static inline bool d_is_dir(const struct dentry *dentry)
{
return d_can_lookup(dentry) || d_is_autodir(dentry);
}
static inline bool d_is_symlink(const struct dentry *dentry)
{
return __d_entry_type(dentry) == DCACHE_SYMLINK_TYPE;