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authorSoumya Koduri <skoduri@redhat.com>2019-09-18 16:32:08 +0530
committerKaleb KEITHLEY <kkeithle@redhat.com>2019-09-25 10:47:36 +0000
commit41a0f2aa755ec7162facd30209f2fa3f40308766 (patch)
tree95285259bbf5580f81796c379fe4383dce9226c7 /api
parent5677b85a59ec98dbe8c99680308403f56d3ce014 (diff)
gfapi: 'glfs_h_creat_open' - new API to create handle and open fd
Right now we have two separate APIs, one - 'glfs_h_creat_handle' to create handle & another - 'glfs_h_open' to create a glfd to return to application Having two separate routines can result in access errors while trying to create and write into a read-only file. Since a fd is opened even during file/directory creation, introducing a new API to make these two operations atomic i.e, which can create both handle & fd and pass them to application Change-Id: Ibf513fcfcdad175f4d7eb6fa7a61b8feec6d33b5 Fixes: bz#1753569 Signed-off-by: Soumya Koduri <skoduri@redhat.com>
Diffstat (limited to 'api')
-rw-r--r--api/src/gfapi.aliases2
-rw-r--r--api/src/gfapi.map5
-rw-r--r--api/src/glfs-handleops.c135
-rw-r--r--api/src/glfs-handles.h5
4 files changed, 147 insertions, 0 deletions
diff --git a/api/src/gfapi.aliases b/api/src/gfapi.aliases
index 023f8c7..c0e0fcf 100644
--- a/api/src/gfapi.aliases
+++ b/api/src/gfapi.aliases
@@ -197,3 +197,5 @@ _pub_glfs_fsetattr _glfs_fsetattr$GFAPI_6.0
_pub_glfs_setattr _glfs_setattr$GFAPI_6.0
_pub_glfs_set_statedump_path _glfs_set_statedump_path@GFAPI_7.0
+
+_pub_glfs_h_creat_open _glfs_h_creat_open@GFAPI_FUTURE
diff --git a/api/src/gfapi.map b/api/src/gfapi.map
index ca20d64..6c821b8 100644
--- a/api/src/gfapi.map
+++ b/api/src/gfapi.map
@@ -276,3 +276,8 @@ GFAPI_7.0 {
global:
glfs_set_statedump_path;
} GFAPI_PRIVATE_6.1;
+
+GFAPI_FUTURE {
+ global:
+ glfs_h_creat_open;
+} GFAPI_7.0;
diff --git a/api/src/glfs-handleops.c b/api/src/glfs-handleops.c
index 8b4307e..8f82a5c 100644
--- a/api/src/glfs-handleops.c
+++ b/api/src/glfs-handleops.c
@@ -843,6 +843,141 @@ invalid_fs:
GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_h_creat, 3.4.2);
struct glfs_object *
+pub_glfs_h_creat_open(struct glfs *fs, struct glfs_object *parent,
+ const char *path, int flags, mode_t mode,
+ struct stat *stat, struct glfs_fd **out_fd)
+{
+ int ret = -1;
+ struct glfs_fd *glfd = NULL;
+ xlator_t *subvol = NULL;
+ inode_t *inode = NULL;
+ loc_t loc = {
+ 0,
+ };
+ struct iatt iatt = {
+ 0,
+ };
+ uuid_t gfid;
+ dict_t *xattr_req = NULL;
+ struct glfs_object *object = NULL;
+ dict_t *fop_attr = NULL;
+
+ /* validate in args */
+ if ((fs == NULL) || (parent == NULL) || (path == NULL) ||
+ (out_fd == NULL)) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ DECLARE_OLD_THIS;
+ __GLFS_ENTRY_VALIDATE_FS(fs, invalid_fs);
+
+ /* get the active volume */
+ subvol = glfs_active_subvol(fs);
+ if (!subvol) {
+ ret = -1;
+ goto out;
+ }
+
+ /* get/refresh the in arg objects inode in correlation to the xlator */
+ inode = glfs_resolve_inode(fs, subvol, parent);
+ if (!inode) {
+ ret = -1;
+ goto out;
+ }
+
+ xattr_req = dict_new();
+ if (!xattr_req) {
+ ret = -1;
+ errno = ENOMEM;
+ goto out;
+ }
+
+ gf_uuid_generate(gfid);
+ ret = dict_set_gfuuid(xattr_req, "gfid-req", gfid, true);
+ if (ret) {
+ ret = -1;
+ errno = ENOMEM;
+ goto out;
+ }
+
+ GLFS_LOC_FILL_PINODE(inode, loc, ret, errno, out, path);
+
+ glfd = glfs_fd_new(fs);
+ if (!glfd) {
+ ret = -1;
+ errno = ENOMEM;
+ goto out;
+ }
+
+ glfd->fd = fd_create(loc.inode, getpid());
+ if (!glfd->fd) {
+ ret = -1;
+ errno = ENOMEM;
+ goto out;
+ }
+ glfd->fd->flags = flags;
+
+ ret = get_fop_attr_thrd_key(&fop_attr);
+ if (ret)
+ gf_msg_debug("gfapi", 0, "Getting leaseid from thread failed");
+
+ /* fop/op */
+ ret = syncop_create(subvol, &loc, flags, mode, glfd->fd, &iatt, xattr_req,
+ NULL);
+ DECODE_SYNCOP_ERR(ret);
+
+ /* populate out args */
+ if (ret == 0) {
+ glfd->fd->flags = flags;
+
+ ret = glfs_loc_link(&loc, &iatt);
+ if (ret != 0) {
+ goto out;
+ }
+
+ if (stat)
+ glfs_iatt_to_stat(fs, &iatt, stat);
+
+ ret = glfs_create_object(&loc, &object);
+ }
+
+out:
+ if (ret && object != NULL) {
+ /* Release the held reference */
+ glfs_h_close(object);
+ object = NULL;
+ }
+
+ loc_wipe(&loc);
+
+ if (inode)
+ inode_unref(inode);
+
+ if (fop_attr)
+ dict_unref(fop_attr);
+
+ if (xattr_req)
+ dict_unref(xattr_req);
+
+ if (ret && glfd) {
+ GF_REF_PUT(glfd);
+ } else if (glfd) {
+ glfd_set_state_bind(glfd);
+ *out_fd = glfd;
+ }
+
+ glfs_subvol_done(fs, subvol);
+
+ __GLFS_EXIT_FS;
+
+invalid_fs:
+ return object;
+}
+
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_h_creat_open, FUTURE);
+
+struct glfs_object *
pub_glfs_h_mkdir(struct glfs *fs, struct glfs_object *parent, const char *path,
mode_t mode, struct stat *stat)
{
diff --git a/api/src/glfs-handles.h b/api/src/glfs-handles.h
index f7e6a06..475f450 100644
--- a/api/src/glfs-handles.h
+++ b/api/src/glfs-handles.h
@@ -250,6 +250,11 @@ int
glfs_h_access(glfs_t *fs, glfs_object_t *object, int mask) __THROW
GFAPI_PUBLIC(glfs_h_access, 3.6.0);
+struct glfs_object *
+glfs_h_creat_open(struct glfs *fs, struct glfs_object *parent, const char *path,
+ int flags, mode_t mode, struct stat *stat,
+ struct glfs_fd **out_fd) __THROW
+ GFAPI_PUBLIC(glfs_h_creat_open, FUTURE);
/*
SYNOPSIS