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authorAnand Avati <avati@redhat.com>2013-05-02 08:00:22 -0700
committerVijay Bellur <vbellur@redhat.com>2013-05-25 11:37:31 -0700
commit05aaec645a6262d431486eb5ac7cd702646cfcfb (patch)
treecc03f1c6ad3b46bedd223a9da7cdedccf71fc461 /xlators/storage
parent9b645be90f76e71f3d1587db66c0c1f9599e5b2d (diff)
dht,posix: support for case discovery
This is support for discovering a filename in a given directory which has a case insensitive match of a given name. It is implemented as a virtual extended attribute on the directory where the required filename is specified in the key. E.g: sh# getfattr -e "text" -n user.glusterfs.get_real_filename:FiLe-B /mnt/samba/patchy getfattr: Removing leading '/' from absolute path names # file: mnt/samba/patchy user.glusterfs.get_real_filename:FiLe-B="file-b" In reality, there can be multiple "answers" as the backend filesystem is case sensitive and there can be multiple files which can strcasecamp() successfully. In this case we pick the first matched file from the first responding server. If a matching file does not exist, we return ENOENT (and NOT ENODATA). This way the caller can differentiate between "unsupported" glusterfs API and file not existing. This API is used by Samba VFS to perform efficient discovery of the real filename without doing a full scan at the Samba level. Change-Id: I53054c4067cba69e585fd0bbce004495bc6e39e8 BUG: 953694 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/4941 Reviewed-by: Vijay Bellur <vbellur@redhat.com> Tested-by: Gluster Build System <jenkins@build.gluster.com>
Diffstat (limited to 'xlators/storage')
-rw-r--r--xlators/storage/posix/src/posix.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index 5e014f8..93577cf 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -2439,6 +2439,53 @@ out:
return 0;
}
+
+int
+posix_xattr_get_real_filename (call_frame_t *frame, xlator_t *this, loc_t *loc,
+ const char *key, dict_t *dict, dict_t *xdata)
+{
+ char *real_path = NULL;
+ struct dirent *dirent = NULL;
+ DIR *fd = NULL;
+ const char *fname = NULL;
+ char *found = NULL;
+ int ret = -1;
+ int op_ret = -1;
+
+ MAKE_INODE_HANDLE (real_path, this, loc, NULL);
+
+ fd = opendir (real_path);
+ if (!fd)
+ return -errno;
+
+ fname = key + strlen (GF_XATTR_GET_REAL_FILENAME_KEY);
+
+ while ((dirent = readdir (fd))) {
+ if (strcasecmp (dirent->d_name, fname) == 0) {
+ found = gf_strdup (dirent->d_name);
+ if (!found) {
+ closedir (fd);
+ return -ENOMEM;
+ }
+ break;
+ }
+ }
+
+ closedir (fd);
+
+ if (!found)
+ return -ENOENT;
+
+ ret = dict_set_dynstr (dict, (char *)key, found);
+ if (ret) {
+ GF_FREE (found);
+ return -ENOMEM;
+ }
+ ret = strlen (found) + 1;
+
+ return ret;
+}
+
/**
* posix_getxattr - this function returns a dictionary with all the
* key:value pair present as xattr. used for
@@ -2493,9 +2540,28 @@ posix_getxattr (call_frame_t *frame, xlator_t *this,
dict = dict_new ();
if (!dict) {
+ op_errno = ENOMEM;
goto out;
}
+ if (loc->inode && name &&
+ (strncmp (name, GF_XATTR_GET_REAL_FILENAME_KEY,
+ strlen (GF_XATTR_GET_REAL_FILENAME_KEY)) == 0)) {
+ ret = posix_xattr_get_real_filename (frame, this, loc,
+ name, dict, xdata);
+ if (ret < 0) {
+ op_ret = -1;
+ op_errno = -ret;
+ gf_log (this->name, GF_LOG_WARNING,
+ "Failed to get rea filename (%s, %s): %s",
+ loc->path, name, strerror (op_errno));
+ goto out;
+ }
+
+ size = ret;
+ goto done;
+ }
+
if (loc->inode && name && !strcmp (name, GLUSTERFS_OPEN_FD_COUNT)) {
if (!list_empty (&loc->inode->fd_list)) {
ret = dict_set_uint32 (dict, (char *)name, 1);