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authorvmallika <vmallika@redhat.com>2016-02-10 06:39:22 +0530
committerRajesh Joseph <rjoseph@redhat.com>2016-03-23 04:03:52 -0700
commited4feadc8c60fce1d8d99e0732351b92230d6321 (patch)
treea075150b6867a32c702939bb08728ca878fa0d48 /xlators/features/snapview-server
parentf5f43424994859f263165f0cdebedffd5f08fdcc (diff)
uss/gluster: generate gfid for snapshot files from snapname and gfid
This is a backport of http://review.gluster.org/#/c/9255/ If 'a' and 'b' are hardlinks, we need to generate a virtual gfid for these files so that the inode number for 'a' and 'b' are same. Generate gfid as below: gfid_of_a = MD5(snapname + back_end_gfid(a)) if '/dir1/a' and '/dir2/b' are hardlinks, then inode number should be same for all below files: /mnt/.snaps/snap1/dir1/a /mnt/.snaps/snap1/dir2/b /mnt/dir1/.snaps/snap1/a /mnt/dir2/.snaps/snap1/b > Change-Id: Ifda793455610e554f3f1e4cbb90d44c02cda4b0f > BUG: 1171703 > Signed-off-by: vmallika <vmallika@redhat.com> Change-Id: I917b2fe2915d88f69700bc8c3283e9c613e13bb8 BUG: 1316099 Signed-off-by: vmallika <vmallika@redhat.com> Reviewed-on: http://review.gluster.org/13656 Smoke: Gluster Build System <jenkins@build.gluster.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Rajesh Joseph <rjoseph@redhat.com>
Diffstat (limited to 'xlators/features/snapview-server')
-rw-r--r--xlators/features/snapview-server/src/snapview-server-helpers.c15
-rw-r--r--xlators/features/snapview-server/src/snapview-server.c121
-rw-r--r--xlators/features/snapview-server/src/snapview-server.h19
3 files changed, 122 insertions, 33 deletions
diff --git a/xlators/features/snapview-server/src/snapview-server-helpers.c b/xlators/features/snapview-server/src/snapview-server-helpers.c
index 92ffdf5..0303f4d 100644
--- a/xlators/features/snapview-server/src/snapview-server-helpers.c
+++ b/xlators/features/snapview-server/src/snapview-server-helpers.c
@@ -335,6 +335,21 @@ out:
}
void
+svs_uuid_generate (uuid_t gfid, char *snapname, uuid_t origin_gfid)
+{
+ unsigned char md5_sum[MD5_DIGEST_LENGTH] = {0};
+ char ino_string[NAME_MAX + 32] = "";
+ int ret = 0;
+
+ GF_ASSERT (snapname);
+
+ ret = snprintf (ino_string, sizeof (ino_string), "%s%s",
+ snapname, uuid_utoa(origin_gfid));
+ MD5((unsigned char *)ino_string, strlen(ino_string), md5_sum);
+ gf_uuid_copy (gfid, md5_sum);
+}
+
+void
svs_fill_ino_from_gfid (struct iatt *buf)
{
uint64_t temp_ino = 0;
diff --git a/xlators/features/snapview-server/src/snapview-server.c b/xlators/features/snapview-server/src/snapview-server.c
index ed30cb8..95e8d3c 100644
--- a/xlators/features/snapview-server/src/snapview-server.c
+++ b/xlators/features/snapview-server/src/snapview-server.c
@@ -261,9 +261,23 @@ svs_lookup_snapshot (xlator_t *this, loc_t *loc, struct iatt *buf,
memcpy (&inode_ctx->buf, buf, sizeof (*buf));
svs_iatt_fill (parent->gfid, postparent);
+ SVS_STRDUP (inode_ctx->snapname, loc->name);
+ if (!inode_ctx->snapname) {
+ op_ret = -1;
+ *op_errno = ENOMEM;
+ goto out;
+ }
op_ret = 0;
out:
+ if (op_ret) {
+ if (object)
+ glfs_h_close (object);
+
+ if (inode_ctx)
+ inode_ctx->object = NULL;
+ }
+
return op_ret;
}
@@ -279,7 +293,7 @@ svs_lookup_entry (xlator_t *this, loc_t *loc, struct iatt *buf,
struct stat statbuf = {0, };
svs_inode_t *inode_ctx = NULL;
glfs_object_t *parent_object = NULL;
- uuid_t gfid;
+ uuid_t gfid = {0, };
GF_VALIDATE_OR_GOTO ("snapview-server", this, out);
GF_VALIDATE_OR_GOTO (this->name, loc, out);
@@ -303,6 +317,14 @@ svs_lookup_entry (xlator_t *this, loc_t *loc, struct iatt *buf,
goto out;
}
+ if (gf_uuid_is_null(object->gfid)) {
+ gf_log (this->name, GF_LOG_DEBUG, "gfid from glfs handle is "
+ "NULL for entry %s (path: %s)", loc->name, loc->path);
+ op_ret = -1;
+ *op_errno = errno;
+ goto out;
+ }
+
inode_ctx = svs_inode_ctx_get_or_new (this, loc->inode);
if (!inode_ctx) {
gf_log (this->name, GF_LOG_ERROR, "failed to "
@@ -314,7 +336,7 @@ svs_lookup_entry (xlator_t *this, loc_t *loc, struct iatt *buf,
if (gf_uuid_is_null (loc->gfid) &&
gf_uuid_is_null (loc->inode->gfid))
- gf_uuid_generate (gfid);
+ svs_uuid_generate (gfid, parent_ctx->snapname, object->gfid);
else {
if (!gf_uuid_is_null (loc->inode->gfid))
gf_uuid_copy (gfid, loc->inode->gfid);
@@ -331,9 +353,26 @@ svs_lookup_entry (xlator_t *this, loc_t *loc, struct iatt *buf,
memcpy (&inode_ctx->buf, buf, sizeof (*buf));
svs_iatt_fill (parent->gfid, postparent);
+ if (IA_ISDIR (buf->ia_type)) {
+ SVS_STRDUP (inode_ctx->snapname, parent_ctx->snapname);
+ if (!inode_ctx->snapname) {
+ op_ret = -1;
+ *op_errno = ENOMEM;
+ goto out;
+ }
+ }
+
op_ret = 0;
out:
+ if (op_ret) {
+ if (object)
+ glfs_h_close (object);
+
+ if (inode_ctx)
+ inode_ctx->object = NULL;
+ }
+
return op_ret;
}
@@ -812,9 +851,10 @@ svs_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, const char *name,
size = glfs_h_getxattrs (fs, object, name, NULL, 0);
if (size == -1) {
- gf_log (this->name, GF_LOG_ERROR, "getxattr "
- "on %s failed (key: %s)", loc->name,
- name);
+ gf_log (this->name,
+ errno == ENODATA?GF_LOG_DEBUG:GF_LOG_ERROR,
+ "getxattr on %s failed (key: %s) with %s",
+ loc->path, name, strerror(errno));
op_ret = -1;
op_errno = errno;
goto out;
@@ -1158,9 +1198,11 @@ svs_forget (xlator_t *this, inode_t *inode)
}
inode_ctx = (svs_inode_t *)value;
+ if (!inode_ctx)
+ goto out;
- if (inode_ctx->object)
- glfs_h_close (inode_ctx->object);
+ if (inode_ctx->snapname)
+ GF_FREE (inode_ctx->snapname);
GF_FREE (inode_ctx);
@@ -1358,38 +1400,51 @@ svs_readdirp_fill (xlator_t *this, inode_t *parent, svs_inode_t *parent_ctx,
gf_uuid_copy (entry->d_stat.ia_gfid, buf.ia_gfid);
}
} else {
- inode = inode_new (parent->table);
- entry->inode = inode;
- gf_uuid_generate (random_gfid);
- gf_uuid_copy (buf.ia_gfid, random_gfid);
- svs_fill_ino_from_gfid (&buf);
- entry->d_ino = buf.ia_ino;
-
- /* If inode context allocation fails, then do not send the
- inode for that particular entry as part of readdirp
- response. Fuse and protocol/server will link the inodes
- in readdirp only if the entry contains inode in it.
- */
- inode_ctx = svs_inode_ctx_get_or_new (this, inode);
- if (!inode_ctx) {
- gf_log (this->name, GF_LOG_ERROR, "failed to allocate "
- "inode context for %s", entry->d_name);
- inode_unref (entry->inode);
- entry->inode = NULL;
- goto out;
- }
-
if (parent_ctx->type == SNAP_VIEW_ENTRY_POINT_INODE) {
+ inode = inode_new (parent->table);
+ entry->inode = inode;
+
+ /* If inode context allocation fails, then do not send
+ * the inode for that particular entry as part of
+ * readdirp response. Fuse and protocol/server will link
+ * the inodes in readdirp only if the entry contains
+ * inode in it.
+ */
+ inode_ctx = svs_inode_ctx_get_or_new (this, inode);
+ if (!inode_ctx) {
+ gf_log (this->name, GF_LOG_ERROR, "failed to "
+ "allocate inode context for %s",
+ entry->d_name);
+ inode_unref (entry->inode);
+ entry->inode = NULL;
+ goto out;
+ }
+
+ /* Generate virtual gfid for SNAPSHOT dir and
+ * update the statbuf
+ */
+ gf_uuid_generate (random_gfid);
+ gf_uuid_copy (buf.ia_gfid, random_gfid);
+ svs_fill_ino_from_gfid (&buf);
buf.ia_type = IA_IFDIR;
- inode_ctx->buf = buf;
+ entry->d_ino = buf.ia_ino;
entry->d_stat = buf;
+ inode_ctx->buf = buf;
inode_ctx->type = SNAP_VIEW_SNAPSHOT_INODE;
} else {
- gf_uuid_copy (entry->d_stat.ia_gfid, buf.ia_gfid);
- entry->d_stat.ia_ino = buf.ia_ino;
- inode_ctx->buf = entry->d_stat;
- inode_ctx->type = SNAP_VIEW_VIRTUAL_INODE;
+ /* For files under snapshot world do not set
+ * entry->inode and reset statbuf (except ia_ino),
+ * so that FUSE/Kernel will send an explicit lookup.
+ * entry->d_stat contains the statbuf information
+ * of original file, so for NFS not to cache this
+ * information and to send explicit lookup, it is
+ * required to reset the statbuf.
+ * Virtual gfid for these files will be generated in the
+ * first lookup.
+ */
+ buf.ia_ino = entry->d_ino;
+ entry->d_stat = buf;
}
}
diff --git a/xlators/features/snapview-server/src/snapview-server.h b/xlators/features/snapview-server/src/snapview-server.h
index c80d345..f9249f9 100644
--- a/xlators/features/snapview-server/src/snapview-server.h
+++ b/xlators/features/snapview-server/src/snapview-server.h
@@ -105,6 +105,17 @@
} \
} while(0);
+#define SVS_STRDUP(dst, src) \
+ do { \
+ if (dst && strcmp (src, dst)) { \
+ GF_FREE (dst); \
+ dst = NULL; \
+ } \
+ \
+ if (!dst) \
+ dst = gf_strdup (src); \
+ } while (0)
+
int
svs_mgmt_submit_request (void *req, call_frame_t *frame,
glusterfs_ctx_t *ctx,
@@ -133,6 +144,11 @@ struct svs_inode {
from where the entry point was entered is saved.
*/
uuid_t pargfid;
+
+ /* This is used to generate gfid for all sub files/dirs under this
+ * snapshot
+ */
+ char *snapname;
struct iatt buf;
};
typedef struct svs_inode svs_inode_t;
@@ -194,6 +210,9 @@ svs_fd_t *
svs_fd_ctx_get_or_new (xlator_t *this, fd_t *fd);
void
+svs_uuid_generate (uuid_t gfid, char *snapname, uuid_t origin_gfid);
+
+void
svs_fill_ino_from_gfid (struct iatt *buf);
void