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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-04-20 23:08:32 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-05-02 19:49:29 -0400 |
| commit | 6192269444ebfbfb42e23c7a6a93c76ffe4b5e51 (patch) | |
| tree | ec40fbbad46725d88f2c16b11ff5976d87f497bb /fs/coda/dir.c | |
| parent | 63b6df14134ddd048984c8afadb46e721815bfc6 (diff) | |
| download | lwn-6192269444ebfbfb42e23c7a6a93c76ffe4b5e51.tar.gz lwn-6192269444ebfbfb42e23c7a6a93c76ffe4b5e51.zip | |
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/coda/dir.c')
| -rw-r--r-- | fs/coda/dir.c | 18 |
1 files changed, 12 insertions, 6 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 */ |