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authorAl Viro <viro@zeniv.linux.org.uk>2016-04-21 06:08:32 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2016-05-03 02:49:29 +0300
commit6192269444ebfbfb42e23c7a6a93c76ffe4b5e51 (patch)
treeec40fbbad46725d88f2c16b11ff5976d87f497bb /fs
parent63b6df14134ddd048984c8afadb46e721815bfc6 (diff)
downloadlinux-6192269444ebfbfb42e23c7a6a93c76ffe4b5e51.tar.xz
introduce a parallel variant of ->iterate()
New method: ->iterate_shared(). Same arguments as in ->iterate(), called with the directory locked only shared. Once all filesystems switch, the old one will be gone. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/coda/dir.c18
-rw-r--r--fs/exportfs/expfs.c2
-rw-r--r--fs/readdir.c20
3 files changed, 29 insertions, 11 deletions
diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index 42e731b8c80a..6fb8672c0892 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -424,16 +424,22 @@ static int coda_readdir(struct file *coda_file, struct dir_context *ctx)
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
- if (host_file->f_op->iterate) {
+ if (host_file->f_op->iterate || host_file->f_op->iterate_shared) {
struct inode *host_inode = file_inode(host_file);
-
- inode_lock(host_inode);
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
- ret = host_file->f_op->iterate(host_file, ctx);
- file_accessed(host_file);
+ if (host_file->f_op->iterate_shared) {
+ inode_lock_shared(host_inode);
+ ret = host_file->f_op->iterate_shared(host_file, ctx);
+ file_accessed(host_file);
+ inode_unlock_shared(host_inode);
+ } else {
+ inode_lock(host_inode);
+ ret = host_file->f_op->iterate(host_file, ctx);
+ file_accessed(host_file);
+ inode_unlock(host_inode);
+ }
}
- inode_unlock(host_inode);
return ret;
}
/* Venus: we must read Venus dirents from a file */
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 402c5caab5ca..207ba8d627ca 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -312,7 +312,7 @@ static int get_name(const struct path *path, char *name, struct dentry *child)
goto out;
error = -EINVAL;
- if (!file->f_op->iterate)
+ if (!file->f_op->iterate && !file->f_op->iterate_shared)
goto out_close;
buffer.sequence = 0;
diff --git a/fs/readdir.c b/fs/readdir.c
index d7308b8f6cf7..a86c6c04b9bc 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -24,15 +24,21 @@
int iterate_dir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
+ bool shared = false;
int res = -ENOTDIR;
- if (!file->f_op->iterate)
+ if (file->f_op->iterate_shared)
+ shared = true;
+ else if (!file->f_op->iterate)
goto out;
res = security_file_permission(file, MAY_READ);
if (res)
goto out;
- inode_lock(inode);
+ if (shared)
+ inode_lock_shared(inode);
+ else
+ inode_lock(inode);
// res = mutex_lock_killable(&inode->i_mutex);
// if (res)
// goto out;
@@ -40,12 +46,18 @@ int iterate_dir(struct file *file, struct dir_context *ctx)
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
ctx->pos = file->f_pos;
- res = file->f_op->iterate(file, ctx);
+ if (shared)
+ res = file->f_op->iterate_shared(file, ctx);
+ else
+ res = file->f_op->iterate(file, ctx);
file->f_pos = ctx->pos;
fsnotify_access(file);
file_accessed(file);
}
- inode_unlock(inode);
+ if (shared)
+ inode_unlock_shared(inode);
+ else
+ inode_unlock(inode);
out:
return res;
}