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introduce a parallel variant of ->iterate()

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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>
This commit is contained in:
Al Viro
2016-04-20 23:08:32 -04:00
parent 63b6df1413
commit 6192269444
5 changed files with 48 additions and 11 deletions
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fs/coda/dir.c
+12 -6
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@@ -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 */