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authorAl Viro <viro@zeniv.linux.org.uk>2013-05-16 00:49:12 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2013-06-29 10:46:47 +0200
commitbb6f619b3a49f940d7478112500da312d70866eb (patch)
tree4e17d6ed5b965eaec2e55b11b61145b200d28f0f /fs
parent[readdir] introduce iterate_dir() and dir_context (diff)
downloadlinux-bb6f619b3a49f940d7478112500da312d70866eb.tar.xz
linux-bb6f619b3a49f940d7478112500da312d70866eb.zip
[readdir] introduce ->iterate(), ctx->pos, dir_emit()
New method - ->iterate(file, ctx). That's the replacement for ->readdir(); it takes callback from ctx->actor, uses ctx->pos instead of file->f_pos and calls dir_emit(ctx, ...) instead of filldir(data, ...). It does *not* update file->f_pos (or look at it, for that matter); iterate_dir() does the update. Note that dir_emit() takes the offset from ctx->pos (and eventually filldir_t will lose that argument). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/coda/dir.c19
-rw-r--r--fs/compat.c4
-rw-r--r--fs/exportfs/expfs.c2
-rw-r--r--fs/nfsd/nfs4recover.c14
-rw-r--r--fs/readdir.c15
5 files changed, 37 insertions, 17 deletions
diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index b7d3a05c062c..fc66861b3598 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -391,8 +391,7 @@ static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
if (!host_file->f_op)
return -ENOTDIR;
- if (host_file->f_op->readdir)
- {
+ if (host_file->f_op->readdir) {
/* potemkin case: we were handed a directory inode.
* We can't use vfs_readdir because we have to keep the file
* position in sync between the coda_file and the host_file.
@@ -410,8 +409,20 @@ static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
coda_file->f_pos = host_file->f_pos;
mutex_unlock(&host_inode->i_mutex);
- }
- else /* Venus: we must read Venus dirents from a file */
+ } else if (host_file->f_op->iterate) {
+ struct inode *host_inode = file_inode(host_file);
+ struct dir_context *ctx = buf;
+
+ mutex_lock(&host_inode->i_mutex);
+ ret = -ENOENT;
+ if (!IS_DEADDIR(host_inode)) {
+ ret = host_file->f_op->iterate(host_file, ctx);
+ file_accessed(host_file);
+ }
+ mutex_unlock(&host_inode->i_mutex);
+
+ coda_file->f_pos = ctx->pos;
+ } else /* Venus: we must read Venus dirents from a file */
ret = coda_venus_readdir(coda_file, buf, filldir);
return ret;
diff --git a/fs/compat.c b/fs/compat.c
index 2279b59e81f2..69ca1e301766 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -975,7 +975,7 @@ asmlinkage long compat_sys_getdents(unsigned int fd,
error = buf.error;
lastdirent = buf.previous;
if (lastdirent) {
- if (put_user(f.file->f_pos, &lastdirent->d_off))
+ if (put_user(buf.ctx.pos, &lastdirent->d_off))
error = -EFAULT;
else
error = count - buf.count;
@@ -1062,7 +1062,7 @@ asmlinkage long compat_sys_getdents64(unsigned int fd,
error = buf.error;
lastdirent = buf.previous;
if (lastdirent) {
- typeof(lastdirent->d_off) d_off = f.file->f_pos;
+ typeof(lastdirent->d_off) d_off = buf.ctx.pos;
if (__put_user_unaligned(d_off, &lastdirent->d_off))
error = -EFAULT;
else
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 7cb190426cec..6c8ef1dd4bdf 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -272,7 +272,7 @@ static int get_name(const struct path *path, char *name, struct dentry *child)
goto out;
error = -EINVAL;
- if (!file->f_op->readdir)
+ if (!file->f_op->readdir && !file->f_op->iterate)
goto out_close;
buffer.name = name;
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 4f8cc6ba7c28..2fa2e2eb190b 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -240,11 +240,16 @@ struct name_list {
struct list_head list;
};
+struct nfs4_dir_ctx {
+ struct dir_context ctx;
+ struct list_head names;
+};
+
static int
nfsd4_build_namelist(void *arg, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
- struct list_head *names = arg;
+ struct nfs4_dir_ctx *ctx = arg;
struct name_list *entry;
if (namlen != HEXDIR_LEN - 1)
@@ -254,7 +259,7 @@ nfsd4_build_namelist(void *arg, const char *name, int namlen,
return -ENOMEM;
memcpy(entry->name, name, HEXDIR_LEN - 1);
entry->name[HEXDIR_LEN - 1] = '\0';
- list_add(&entry->list, names);
+ list_add(&entry->list, &ctx->names);
return 0;
}
@@ -263,10 +268,7 @@ nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
{
const struct cred *original_cred;
struct dentry *dir = nn->rec_file->f_path.dentry;
- struct {
- struct dir_context ctx;
- struct list_head names;
- } ctx;
+ struct nfs4_dir_ctx ctx;
int status;
status = nfs4_save_creds(&original_cred);
diff --git a/fs/readdir.c b/fs/readdir.c
index 5b620a2b45e6..5d6578affbbf 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -24,7 +24,7 @@ int iterate_dir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
int res = -ENOTDIR;
- if (!file->f_op || !file->f_op->readdir)
+ if (!file->f_op || (!file->f_op->readdir && !file->f_op->iterate))
goto out;
res = security_file_permission(file, MAY_READ);
@@ -37,7 +37,14 @@ int iterate_dir(struct file *file, struct dir_context *ctx)
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
- res = file->f_op->readdir(file, ctx, ctx->actor);
+ if (file->f_op->iterate) {
+ ctx->pos = file->f_pos;
+ res = file->f_op->iterate(file, ctx);
+ file->f_pos = ctx->pos;
+ } else {
+ res = file->f_op->readdir(file, ctx, ctx->actor);
+ ctx->pos = file->f_pos;
+ }
file_accessed(file);
}
mutex_unlock(&inode->i_mutex);
@@ -214,7 +221,7 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd,
error = buf.error;
lastdirent = buf.previous;
if (lastdirent) {
- if (put_user(f.file->f_pos, &lastdirent->d_off))
+ if (put_user(buf.ctx.pos, &lastdirent->d_off))
error = -EFAULT;
else
error = count - buf.count;
@@ -296,7 +303,7 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd,
error = buf.error;
lastdirent = buf.previous;
if (lastdirent) {
- typeof(lastdirent->d_off) d_off = f.file->f_pos;
+ typeof(lastdirent->d_off) d_off = buf.ctx.pos;
if (__put_user(d_off, &lastdirent->d_off))
error = -EFAULT;
else