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[readdir] switch dcache_readdir() users to ->iterate()
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new helpers - dir_emit_dot(file, ctx, dentry), dir_emit_dotdot(file, ctx),
dir_emit_dots(file, ctx).

Signed-off-by: Al Viro <[email protected]>
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Al Viro committed Jun 29, 2013
1 parent 8088629 commit 5f99f4e
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Showing 4 changed files with 65 additions and 60 deletions.
2 changes: 1 addition & 1 deletion arch/powerpc/platforms/cell/spufs/inode.c
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Original file line number Diff line number Diff line change
Expand Up @@ -238,7 +238,7 @@ const struct file_operations spufs_context_fops = {
.release = spufs_dir_close,
.llseek = dcache_dir_lseek,
.read = generic_read_dir,
.readdir = dcache_readdir,
.iterate = dcache_readdir,
.fsync = noop_fsync,
};
EXPORT_SYMBOL_GPL(spufs_context_fops);
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4 changes: 2 additions & 2 deletions fs/autofs4/root.c
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@ const struct file_operations autofs4_root_operations = {
.open = dcache_dir_open,
.release = dcache_dir_close,
.read = generic_read_dir,
.readdir = dcache_readdir,
.iterate = dcache_readdir,
.llseek = dcache_dir_lseek,
.unlocked_ioctl = autofs4_root_ioctl,
#ifdef CONFIG_COMPAT
Expand All @@ -53,7 +53,7 @@ const struct file_operations autofs4_dir_operations = {
.open = autofs4_dir_open,
.release = dcache_dir_close,
.read = generic_read_dir,
.readdir = dcache_readdir,
.iterate = dcache_readdir,
.llseek = dcache_dir_lseek,
};

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80 changes: 30 additions & 50 deletions fs/libfs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -135,60 +135,40 @@ static inline unsigned char dt_type(struct inode *inode)
* both impossible due to the lock on directory.
*/

int dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
int dcache_readdir(struct file *file, struct dir_context *ctx)
{
struct dentry *dentry = filp->f_path.dentry;
struct dentry *cursor = filp->private_data;
struct dentry *dentry = file->f_path.dentry;
struct dentry *cursor = file->private_data;
struct list_head *p, *q = &cursor->d_u.d_child;
ino_t ino;
int i = filp->f_pos;

switch (i) {
case 0:
ino = dentry->d_inode->i_ino;
if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
break;
filp->f_pos++;
i++;
/* fallthrough */
case 1:
ino = parent_ino(dentry);
if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
break;
filp->f_pos++;
i++;
/* fallthrough */
default:
spin_lock(&dentry->d_lock);
if (filp->f_pos == 2)
list_move(q, &dentry->d_subdirs);

for (p=q->next; p != &dentry->d_subdirs; p=p->next) {
struct dentry *next;
next = list_entry(p, struct dentry, d_u.d_child);
spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
if (!simple_positive(next)) {
spin_unlock(&next->d_lock);
continue;
}
if (!dir_emit_dots(file, ctx))
return 0;
spin_lock(&dentry->d_lock);
if (ctx->pos == 2)
list_move(q, &dentry->d_subdirs);

for (p = q->next; p != &dentry->d_subdirs; p = p->next) {
struct dentry *next = list_entry(p, struct dentry, d_u.d_child);
spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
if (!simple_positive(next)) {
spin_unlock(&next->d_lock);
continue;
}

spin_unlock(&next->d_lock);
spin_unlock(&dentry->d_lock);
if (filldir(dirent, next->d_name.name,
next->d_name.len, filp->f_pos,
next->d_inode->i_ino,
dt_type(next->d_inode)) < 0)
return 0;
spin_lock(&dentry->d_lock);
spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
/* next is still alive */
list_move(q, p);
spin_unlock(&next->d_lock);
p = q;
filp->f_pos++;
}
spin_unlock(&dentry->d_lock);
spin_unlock(&next->d_lock);
spin_unlock(&dentry->d_lock);
if (!dir_emit(ctx, next->d_name.name, next->d_name.len,
next->d_inode->i_ino, dt_type(next->d_inode)))
return 0;
spin_lock(&dentry->d_lock);
spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
/* next is still alive */
list_move(q, p);
spin_unlock(&next->d_lock);
p = q;
ctx->pos++;
}
spin_unlock(&dentry->d_lock);
return 0;
}

Expand All @@ -202,7 +182,7 @@ const struct file_operations simple_dir_operations = {
.release = dcache_dir_close,
.llseek = dcache_dir_lseek,
.read = generic_read_dir,
.readdir = dcache_readdir,
.iterate = dcache_readdir,
.fsync = noop_fsync,
};

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39 changes: 32 additions & 7 deletions include/linux/fs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1511,12 +1511,6 @@ struct dir_context {
loff_t pos;
};

static inline bool dir_emit(struct dir_context *ctx,
const char *name, int namelen,
u64 ino, unsigned type)
{
return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0;
}
struct block_device_operations;

/* These macros are for out of kernel modules to test that
Expand Down Expand Up @@ -2537,7 +2531,7 @@ extern void iterate_supers_type(struct file_system_type *,
extern int dcache_dir_open(struct inode *, struct file *);
extern int dcache_dir_close(struct inode *, struct file *);
extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
extern int dcache_readdir(struct file *, void *, filldir_t);
extern int dcache_readdir(struct file *, struct dir_context *);
extern int simple_setattr(struct dentry *, struct iattr *);
extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern int simple_statfs(struct dentry *, struct kstatfs *);
Expand Down Expand Up @@ -2701,4 +2695,35 @@ static inline void inode_has_no_xattr(struct inode *inode)
inode->i_flags |= S_NOSEC;
}

static inline bool dir_emit(struct dir_context *ctx,
const char *name, int namelen,
u64 ino, unsigned type)
{
return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0;
}
static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
{
return ctx->actor(ctx, ".", 1, ctx->pos,
file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0;
}
static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
{
return ctx->actor(ctx, "..", 2, ctx->pos,
parent_ino(file->f_path.dentry), DT_DIR) == 0;
}
static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
{
if (ctx->pos == 0) {
if (!dir_emit_dot(file, ctx))
return false;
ctx->pos = 1;
}
if (ctx->pos == 1) {
if (!dir_emit_dotdot(file, ctx))
return false;
ctx->pos = 2;
}
return true;
}

#endif /* _LINUX_FS_H */

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