static fsal_status_t
gpfs_open_again(struct fsal_obj_handle *obj_hdl, fsal_openflags_t openflags,
bool reopen)
{
struct gpfs_fsal_obj_handle *myself =
container_of(obj_hdl, struct gpfs_fsal_obj_handle, obj_handle);
fsal_status_t status;
int posix_flags = 0;
int fd = -1;
if (reopen) {
assert(myself->u.file.fd.fd >= 0 &&
myself->u.file.fd.openflags != FSAL_O_CLOSED);
fd = myself->u.file.fd.fd;
} else {
assert(myself->u.file.fd.fd == -1 &&
myself->u.file.fd.openflags == FSAL_O_CLOSED);
}
fsal2posix_openflags(openflags, &posix_flags);
status = GPFSFSAL_open(obj_hdl, op_ctx, posix_flags, &fd, reopen);
if (FSAL_IS_ERROR(status) == false) {
myself->u.file.fd.fd = fd;
myself->u.file.fd.openflags = openflags;
}
return status;
}
/**
* FSAL_open:
* Open a regular file for reading/writing its data content.
*
* \param filehandle (input):
* Handle of the file to be read/modified.
* \param cred (input):
* Authentication context for the operation (user,...).
* \param openflags (input):
* Flags that indicates behavior for file opening and access.
* This is an inclusive OR of the following values
* ( such of them are not compatible) :
* - FSAL_O_RDONLY: opening file for reading only.
* - FSAL_O_RDWR: opening file for reading and writing.
* - FSAL_O_WRONLY: opening file for writting only.
* - FSAL_O_APPEND: always write at the end of the file.
* - FSAL_O_TRUNC: truncate the file to 0 on opening.
* \param file_descriptor (output):
* The file descriptor to be used for FSAL_read/write operations.
* \param file_attributes (optionnal input/output):
* Post operation attributes.
* As input, it defines the attributes that the caller
* wants to retrieve (by positioning flags into this structure)
* and the output is built considering this input
* (it fills the structure according to the flags it contains).
*
* \return Major error codes:
* - ERR_FSAL_NO_ERROR: no error.
* - Another error code if an error occured during this call.
*/
fsal_status_t GPFSFSAL_open(fsal_handle_t * p_filehandle, /* IN */
fsal_op_context_t * p_context, /* IN */
fsal_openflags_t openflags, /* IN */
fsal_file_t * file_desc, /* OUT */
fsal_attrib_list_t * p_file_attributes /* [ IN/OUT ] */
)
{
int rc, errsv;
fsal_status_t status;
int fd;
int posix_flags = 0;
gpfsfsal_file_t * p_file_descriptor = (gpfsfsal_file_t *)file_desc;
/* sanity checks.
* note : file_attributes is optional.
*/
if(!p_filehandle || !p_context || !p_file_descriptor)
Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_open);
/* convert fsal open flags to posix open flags */
rc = fsal2posix_openflags(openflags, &posix_flags);
/* flags conflicts. */
if(rc)
{
LogWarn(COMPONENT_FSAL, "Invalid/conflicting flags : %#X", openflags);
Return(rc, 0, INDEX_FSAL_open);
}
TakeTokenFSCall();
status = fsal_internal_handle2fd(p_context, p_filehandle, &fd, posix_flags);
ReleaseTokenFSCall();
if(FSAL_IS_ERROR(status))
ReturnStatus(status, INDEX_FSAL_open);
/* output attributes */
if(p_file_attributes)
{
p_file_attributes->asked_attributes = GPFS_SUPPORTED_ATTRIBUTES;
status = GPFSFSAL_getattrs(p_filehandle, p_context, p_file_attributes);
if(FSAL_IS_ERROR(status))
ReturnStatus(status, INDEX_FSAL_open);
}
TakeTokenFSCall();
p_file_descriptor->fd = fd;
errsv = errno;
ReleaseTokenFSCall();
/* set the read-only flag of the file descriptor */
p_file_descriptor->ro = openflags & FSAL_O_RDONLY;
Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_open);
}
static fsal_status_t vfs_open_func(struct fsal_obj_handle *obj_hdl,
fsal_openflags_t openflags,
struct fsal_fd *fd)
{
struct vfs_fsal_obj_handle *myself;
int posix_flags = 0;
myself = container_of(obj_hdl, struct vfs_fsal_obj_handle, obj_handle);
fsal2posix_openflags(openflags, &posix_flags);
return vfs_open_my_fd(myself, openflags, posix_flags,
(struct vfs_fd *)fd);
}
static fsal_status_t file_open(struct fsal_obj_handle *obj_hdl,
const struct req_op_context *opctx,
fsal_openflags_t openflags)
{
int rc = 0;
fsal_status_t status = { ERR_FSAL_NO_ERROR, 0 };
struct glfs_fd *glfd = NULL;
int p_flags = 0;
struct glusterfs_export *glfs_export =
container_of(obj_hdl->export, struct glusterfs_export, export);
struct glusterfs_handle *objhandle =
container_of(obj_hdl, struct glusterfs_handle, handle);
#ifdef GLTIMING
struct timespec s_time, e_time;
now(&s_time);
#endif
if (objhandle->openflags != FSAL_O_CLOSED) {
return fsalstat(ERR_FSAL_SERVERFAULT, 0);
}
rc = fsal2posix_openflags(openflags, &p_flags);
if (rc != 0) {
status.major = rc;
goto out;
}
glfd = glfs_h_open(glfs_export->gl_fs, objhandle->glhandle, p_flags);
if (glfd == NULL) {
status = gluster2fsal_error(errno);
goto out;
}
objhandle->openflags = openflags;
objhandle->glfd = glfd;
out:
#ifdef GLTIMING
now(&e_time);
latency_update(&s_time, &e_time, lat_file_open);
#endif
return status;
}
static fsal_status_t
gpfs_open_func(struct fsal_obj_handle *obj_hdl, fsal_openflags_t openflags,
struct fsal_fd *fd)
{
fsal_status_t status;
struct gpfs_fd *my_fd = (struct gpfs_fd *)fd;
int posix_flags = 0;
my_fd->fd = -1;
fsal2posix_openflags(openflags, &posix_flags);
status = GPFSFSAL_open(obj_hdl, op_ctx, posix_flags, &my_fd->fd, false);
if (FSAL_IS_ERROR(status) == false)
my_fd->openflags = openflags;
LogFullDebug(COMPONENT_FSAL, "new fd %d", my_fd->fd);
return status;
}
fsal_status_t vfs_open(struct fsal_obj_handle *obj_hdl,
fsal_openflags_t openflags)
{
struct vfs_fsal_obj_handle *myself;
int fd;
fsal_errors_t fsal_error = ERR_FSAL_NO_ERROR;
int posix_flags = 0;
int retval = 0;
myself = container_of(obj_hdl, struct vfs_fsal_obj_handle, obj_handle);
if (obj_hdl->fsal != obj_hdl->fs->fsal) {
LogDebug(COMPONENT_FSAL,
"FSAL %s operation for handle belonging to FSAL %s, return EXDEV",
obj_hdl->fsal->name, obj_hdl->fs->fsal->name);
retval = EXDEV;
fsal_error = posix2fsal_error(retval);
return fsalstat(fsal_error, retval);
}
/* Take write lock on object to protect file descriptor. */
PTHREAD_RWLOCK_wrlock(&obj_hdl->lock);
assert(myself->u.file.fd == -1
&& myself->u.file.openflags == FSAL_O_CLOSED && openflags != 0);
fsal2posix_openflags(openflags, &posix_flags);
LogFullDebug(COMPONENT_FSAL, "open_by_handle_at flags from %x to %x",
openflags, posix_flags);
fd = vfs_fsal_open(myself, posix_flags, &fsal_error);
if (fd < 0) {
retval = -fd;
} else {
myself->u.file.fd = fd;
myself->u.file.openflags = openflags;
}
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
return fsalstat(fsal_error, retval);
}
fsal_status_t find_fd(int *fd,
struct fsal_obj_handle *obj_hdl,
bool bypass,
struct state_t *state,
fsal_openflags_t openflags,
bool *has_lock,
bool *need_fsync,
bool *closefd,
bool open_for_locks)
{
struct vfs_fsal_obj_handle *myself;
struct vfs_filesystem *vfs_fs;
struct vfs_fd temp_fd = {0, -1}, *out_fd = &temp_fd;
fsal_status_t status = {ERR_FSAL_NO_ERROR, 0};
int rc, posix_flags;
myself = container_of(obj_hdl, struct vfs_fsal_obj_handle, obj_handle);
vfs_fs = myself->obj_handle.fs->private_data;
fsal2posix_openflags(openflags, &posix_flags);
/* Handle nom-regular files */
switch (obj_hdl->type) {
case SOCKET_FILE:
case CHARACTER_FILE:
case BLOCK_FILE:
rc = vfs_open_by_handle(vfs_fs,
myself->u.unopenable.dir,
O_PATH | O_NOACCESS,
&status.major);
if (rc < 0) {
LogDebug(COMPONENT_FSAL,
"Failed with %s openflags 0x%08x",
strerror(-rc), O_PATH | O_NOACCESS);
return fsalstat(posix2fsal_error(-rc), -rc);
}
*fd = rc;
*closefd = true;
return status;
case REGULAR_FILE:
status = fsal_find_fd((struct fsal_fd **)&out_fd, obj_hdl,
(struct fsal_fd *)&myself->u.file.fd,
&myself->u.file.share,
bypass, state, openflags,
vfs_open_func, vfs_close_func,
has_lock, need_fsync,
closefd, open_for_locks);
*fd = out_fd->fd;
return status;
case SYMBOLIC_LINK:
posix_flags |= (O_PATH | O_RDWR | O_NOFOLLOW);
break;
case FIFO_FILE:
posix_flags |= O_NONBLOCK;
break;
case DIRECTORY:
break;
case NO_FILE_TYPE:
case EXTENDED_ATTR:
return fsalstat(posix2fsal_error(EINVAL), EINVAL);
}
/* Open file descriptor for non-regular files. */
rc = vfs_fsal_open(myself, posix_flags, &status.major);
if (rc < 0) {
LogDebug(COMPONENT_FSAL,
"Failed with %s openflags 0x%08x",
strerror(-rc), openflags);
return fsalstat(posix2fsal_error(-rc), -rc);
}
LogFullDebug(COMPONENT_FSAL,
"Opened fd=%d for file of type %s",
rc, object_file_type_to_str(obj_hdl->type));
*fd = rc;
*closefd = true;
return status;
}
fsal_status_t vfs_reopen2(struct fsal_obj_handle *obj_hdl,
struct state_t *state,
fsal_openflags_t openflags)
{
struct vfs_fd fd, *my_fd = &fd, *my_share_fd;
struct vfs_fsal_obj_handle *myself;
fsal_status_t status = {0, 0};
int posix_flags = 0;
fsal_openflags_t old_openflags;
my_share_fd = (struct vfs_fd *)(state + 1);
fsal2posix_openflags(openflags, &posix_flags);
LogFullDebug(COMPONENT_FSAL,
posix_flags & O_TRUNC ? "Truncate" : "No truncate");
memset(my_fd, 0, sizeof(*my_fd));
fd.fd = -1;
myself = container_of(obj_hdl,
struct vfs_fsal_obj_handle,
obj_handle);
if (obj_hdl->fsal != obj_hdl->fs->fsal) {
LogDebug(COMPONENT_FSAL,
"FSAL %s operation for handle belonging to FSAL %s, return EXDEV",
obj_hdl->fsal->name, obj_hdl->fs->fsal->name);
return fsalstat(posix2fsal_error(EXDEV), EXDEV);
}
/* This can block over an I/O operation. */
PTHREAD_RWLOCK_wrlock(&obj_hdl->lock);
old_openflags = my_share_fd->openflags;
/* We can conflict with old share, so go ahead and check now. */
status = check_share_conflict(&myself->u.file.share, openflags, false);
if (FSAL_IS_ERROR(status)) {
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
return status;
}
/* Set up the new share so we can drop the lock and not have a
* conflicting share be asserted, updating the share counters.
*/
update_share_counters(&myself->u.file.share, old_openflags, openflags);
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
status = vfs_open_my_fd(myself, openflags, posix_flags, my_fd);
if (!FSAL_IS_ERROR(status)) {
/* Close the existing file descriptor and copy the new
* one over.
*/
vfs_close_my_fd(my_share_fd);
*my_share_fd = fd;
} else {
/* We had a failure on open - we need to revert the share.
* This can block over an I/O operation.
*/
PTHREAD_RWLOCK_wrlock(&obj_hdl->lock);
update_share_counters(&myself->u.file.share,
openflags,
old_openflags);
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
}
return status;
}
fsal_status_t vfs_open2(struct fsal_obj_handle *obj_hdl,
struct state_t *state,
fsal_openflags_t openflags,
enum fsal_create_mode createmode,
const char *name,
struct attrlist *attrib_set,
fsal_verifier_t verifier,
struct fsal_obj_handle **new_obj,
struct attrlist *attrs_out,
bool *caller_perm_check)
{
int posix_flags = 0;
int fd, dir_fd;
int retval = 0;
mode_t unix_mode;
fsal_status_t status = {0, 0};
struct vfs_fd *my_fd = NULL;
struct vfs_fsal_obj_handle *myself, *hdl = NULL;
struct stat stat;
vfs_file_handle_t *fh = NULL;
bool truncated;
bool created = false;
if (state != NULL)
my_fd = (struct vfs_fd *)(state + 1);
myself = container_of(obj_hdl, struct vfs_fsal_obj_handle, obj_handle);
LogAttrlist(COMPONENT_FSAL, NIV_FULL_DEBUG,
"attrib_set ", attrib_set, false);
fsal2posix_openflags(openflags, &posix_flags);
truncated = (posix_flags & O_TRUNC) != 0;
LogFullDebug(COMPONENT_FSAL,
truncated ? "Truncate" : "No truncate");
if (createmode >= FSAL_EXCLUSIVE) {
/* Now fixup attrs for verifier if exclusive create */
set_common_verifier(attrib_set, verifier);
}
if (name == NULL) {
/* This is an open by handle */
struct vfs_fsal_obj_handle *myself;
myself = container_of(obj_hdl,
struct vfs_fsal_obj_handle,
obj_handle);
if (obj_hdl->fsal != obj_hdl->fs->fsal) {
LogDebug(COMPONENT_FSAL,
"FSAL %s operation for handle belonging to FSAL %s, return EXDEV",
obj_hdl->fsal->name, obj_hdl->fs->fsal->name);
return fsalstat(posix2fsal_error(EXDEV), EXDEV);
}
if (state != NULL) {
/* Prepare to take the share reservation, but only if we
* are called with a valid state (if state is NULL the
* caller is a stateless create such as NFS v3 CREATE).
*/
/* This can block over an I/O operation. */
PTHREAD_RWLOCK_wrlock(&obj_hdl->lock);
/* Check share reservation conflicts. */
status = check_share_conflict(&myself->u.file.share,
openflags,
false);
if (FSAL_IS_ERROR(status)) {
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
return status;
}
/* Take the share reservation now by updating the
* counters.
*/
update_share_counters(&myself->u.file.share,
FSAL_O_CLOSED,
openflags);
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
} else {
/* We need to use the global fd to continue, and take
* the lock to protect it.
*/
my_fd = &hdl->u.file.fd;
PTHREAD_RWLOCK_wrlock(&obj_hdl->lock);
}
status = vfs_open_my_fd(myself, openflags, posix_flags, my_fd);
if (FSAL_IS_ERROR(status)) {
if (state == NULL) {
/* Release the lock taken above, and return
* since there is nothing to undo.
*/
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
return status;
} else {
/* Error - need to release the share */
goto undo_share;
}
}
if (createmode >= FSAL_EXCLUSIVE || truncated) {
/* Refresh the attributes */
struct stat stat;
retval = fstat(my_fd->fd, &stat);
if (retval == 0) {
LogFullDebug(COMPONENT_FSAL,
"New size = %" PRIx64,
stat.st_size);
} else {
if (errno == EBADF)
errno = ESTALE;
status = fsalstat(posix2fsal_error(errno),
errno);
}
/* Now check verifier for exclusive, but not for
* FSAL_EXCLUSIVE_9P.
*/
if (!FSAL_IS_ERROR(status) &&
createmode >= FSAL_EXCLUSIVE &&
createmode != FSAL_EXCLUSIVE_9P &&
!check_verifier_stat(&stat, verifier)) {
/* Verifier didn't match, return EEXIST */
status =
fsalstat(posix2fsal_error(EEXIST), EEXIST);
}
}
if (state == NULL) {
/* If no state, release the lock taken above and return
* status.
*/
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
return status;
}
if (!FSAL_IS_ERROR(status)) {
/* Return success. */
return status;
}
(void) vfs_close_my_fd(my_fd);
undo_share:
/* Can only get here with state not NULL and an error */
/* On error we need to release our share reservation
* and undo the update of the share counters.
* This can block over an I/O operation.
*/
PTHREAD_RWLOCK_wrlock(&obj_hdl->lock);
update_share_counters(&myself->u.file.share,
openflags,
FSAL_O_CLOSED);
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
return status;
}
/* In this path where we are opening by name, we can't check share
* reservation yet since we don't have an object_handle yet. If we
* indeed create the object handle (there is no race with another
* open by name), then there CAN NOT be a share conflict, otherwise
* the share conflict will be resolved when the object handles are
* merged.
*/
#ifdef ENABLE_VFS_DEBUG_ACL
if (createmode != FSAL_NO_CREATE) {
/* Need to ammend attributes for inherited ACL, these will be
* set later. We also need to test for permission to create
* since there might be an ACL.
*/
struct attrlist attrs;
fsal_accessflags_t access_type;
access_type = FSAL_MODE_MASK_SET(FSAL_W_OK) |
FSAL_ACE4_MASK_SET(FSAL_ACE_PERM_ADD_FILE);
status = obj_hdl->obj_ops.test_access(obj_hdl, access_type,
NULL, NULL, false);
if (FSAL_IS_ERROR(status))
return status;
fsal_prepare_attrs(&attrs, ATTR_ACL);
status = obj_hdl->obj_ops.getattrs(obj_hdl, &attrs);
if (FSAL_IS_ERROR(status))
return status;
status.major = fsal_inherit_acls(attrib_set, attrs.acl,
FSAL_ACE_FLAG_FILE_INHERIT);
/* Done with the attrs */
fsal_release_attrs(&attrs);
if (FSAL_IS_ERROR(status))
return status;
}
#endif /* ENABLE_VFS_DEBUG_ACL */
if (createmode != FSAL_NO_CREATE) {
/* Now add in O_CREAT and O_EXCL. */
posix_flags |= O_CREAT;
/* And if we are at least FSAL_GUARDED, do an O_EXCL create. */
if (createmode >= FSAL_GUARDED)
posix_flags |= O_EXCL;
/* Fetch the mode attribute to use in the openat system call. */
unix_mode = fsal2unix_mode(attrib_set->mode) &
~op_ctx->fsal_export->exp_ops.fs_umask(op_ctx->fsal_export);
/* Don't set the mode if we later set the attributes */
FSAL_UNSET_MASK(attrib_set->mask, ATTR_MODE);
}
if (createmode == FSAL_UNCHECKED && (attrib_set->mask != 0)) {
/* If we have FSAL_UNCHECKED and want to set more attributes
* than the mode, we attempt an O_EXCL create first, if that
* succeeds, then we will be allowed to set the additional
* attributes, otherwise, we don't know we created the file
* and this can NOT set the attributes.
*/
posix_flags |= O_EXCL;
}
dir_fd = vfs_fsal_open(myself, O_PATH | O_NOACCESS, &status.major);
if (dir_fd < 0)
return fsalstat(status.major, -dir_fd);
/** @todo: not sure what this accomplishes... */
retval = vfs_stat_by_handle(dir_fd, &stat);
if (retval < 0) {
retval = errno;
status = fsalstat(posix2fsal_error(retval), retval);
goto direrr;
}
/* Become the user because we are creating an object in this dir.
*/
if (createmode != FSAL_NO_CREATE)
fsal_set_credentials(op_ctx->creds);
if ((posix_flags & O_CREAT) != 0)
fd = openat(dir_fd, name, posix_flags, unix_mode);
else
fd = openat(dir_fd, name, posix_flags);
if (fd == -1 && errno == EEXIST && createmode == FSAL_UNCHECKED) {
/* We tried to create O_EXCL to set attributes and failed.
* Remove O_EXCL and retry. We still try O_CREAT again just in
* case file disappears out from under us.
*
* Note that because we have dropped O_EXCL, later on we will
* not assume we created the file, and thus will not set
* additional attributes. We don't need to separately track
* the condition of not wanting to set attributes.
*/
posix_flags &= ~O_EXCL;
fd = openat(dir_fd, name, posix_flags, unix_mode);
}
/* Preserve errno */
retval = errno;
/* If we were creating, restore credentials now. */
if (createmode != FSAL_NO_CREATE)
fsal_restore_ganesha_credentials();
if (fd < 0) {
status = fsalstat(posix2fsal_error(retval), retval);
goto direrr;
}
/* Remember if we were responsible for creating the file.
* Note that in an UNCHECKED retry we MIGHT have re-created the
* file and won't remember that. Oh well, so in that rare case we
* leak a partially created file if we have a subsequent error in here.
* Also notify caller to do permission check if we DID NOT create the
* file. Note it IS possible in the case of a race between an UNCHECKED
* open and an external unlink, we did create the file, but we will
* still force a permission check. Of course that permission check
* SHOULD succeed since we also won't set the mode the caller requested
* and the default file create permissions SHOULD allow the owner
* read/write.
*/
created = (posix_flags & O_EXCL) != 0;
*caller_perm_check = !created;
vfs_alloc_handle(fh);
retval = vfs_name_to_handle(dir_fd, obj_hdl->fs, name, fh);
if (retval < 0) {
retval = errno;
status = fsalstat(posix2fsal_error(retval), retval);
goto fileerr;
}
retval = fstat(fd, &stat);
if (retval < 0) {
retval = errno;
status = fsalstat(posix2fsal_error(retval), retval);
goto fileerr;
}
/* allocate an obj_handle and fill it up */
hdl = alloc_handle(dir_fd, fh, obj_hdl->fs, &stat, myself->handle, name,
op_ctx->fsal_export);
if (hdl == NULL) {
status = fsalstat(posix2fsal_error(ENOMEM), ENOMEM);
goto fileerr;
}
/* If we didn't have a state above, use the global fd. At this point,
* since we just created the global fd, no one else can have a
* reference to it, and thus we can mamnipulate unlocked which is
* handy since we can then call setattr2 which WILL take the lock
* without a double locking deadlock.
*/
if (my_fd == NULL)
my_fd = &hdl->u.file.fd;
my_fd->fd = fd;
my_fd->openflags = openflags;
*new_obj = &hdl->obj_handle;
if (created && attrib_set->mask != 0) {
/* Set attributes using our newly opened file descriptor as the
* share_fd if there are any left to set (mode and truncate
* have already been handled).
*
* Note that we only set the attributes if we were responsible
* for creating the file and we have attributes to set.
*
* Note if we have ENABLE_VFS_DEBUG_ACL an inherited ACL might
* be part of the attributes we are setting here.
*/
status = (*new_obj)->obj_ops.setattr2(*new_obj,
false,
state,
attrib_set);
if (FSAL_IS_ERROR(status)) {
/* Release the handle we just allocated. */
(*new_obj)->obj_ops.release(*new_obj);
*new_obj = NULL;
goto fileerr;
}
if (attrs_out != NULL) {
status = (*new_obj)->obj_ops.getattrs(*new_obj,
attrs_out);
if (FSAL_IS_ERROR(status) &&
(attrs_out->mask & ATTR_RDATTR_ERR) == 0) {
/* Get attributes failed and caller expected
* to get the attributes. Otherwise continue
* with attrs_out indicating ATTR_RDATTR_ERR.
*/
goto fileerr;
}
}
} else if (attrs_out != NULL) {
/* Since we haven't set any attributes other than what was set
* on create (if we even created), just use the stat results
* we used to create the fsal_obj_handle.
*/
posix2fsal_attributes(&stat, attrs_out);
/* Make sure ATTR_RDATTR_ERR is cleared on success. */
attrs_out->mask &= ~ATTR_RDATTR_ERR;
}
close(dir_fd);
if (state != NULL) {
/* Prepare to take the share reservation, but only if we are
* called with a valid state (if state is NULL the caller is
* a stateless create such as NFS v3 CREATE).
*/
/* This can block over an I/O operation. */
PTHREAD_RWLOCK_wrlock(&(*new_obj)->lock);
/* Take the share reservation now by updating the counters. */
update_share_counters(&hdl->u.file.share,
FSAL_O_CLOSED,
openflags);
PTHREAD_RWLOCK_unlock(&(*new_obj)->lock);
}
return fsalstat(ERR_FSAL_NO_ERROR, 0);
fileerr:
close(fd);
/* Delete the file if we actually created it. */
if (created)
unlinkat(dir_fd, name, 0);
direrr:
close(dir_fd);
return fsalstat(posix2fsal_error(retval), retval);
}
/**
* @brief Open a file descriptor for read or write and possibly create
*
* This function opens a file for read or write, possibly creating it.
* If the caller is passing a state, it must hold the state_lock
* exclusive.
*
* state can be NULL which indicates a stateless open (such as via the
* NFS v3 CREATE operation), in which case the FSAL must assure protection
* of any resources. If the file is being created, such protection is
* simple since no one else will have access to the object yet, however,
* in the case of an exclusive create, the common resources may still need
* protection.
*
* If Name is NULL, obj_hdl is the file itself, otherwise obj_hdl is the
* parent directory.
*
* On an exclusive create, the upper layer may know the object handle
* already, so it MAY call with name == NULL. In this case, the caller
* expects just to check the verifier.
*
* On a call with an existing object handle for an UNCHECKED create,
* we can set the size to 0.
*
* At least the mode attribute must be set if createmode is not FSAL_NO_CREATE.
* Some FSALs may still have to pass a mode on a create call for exclusive,
* and even with FSAL_NO_CREATE, and empty set of attributes MUST be passed.
*
* If an open by name succeeds and did not result in Ganesha creating a file,
* the caller will need to do a subsequent permission check to confirm the
* open. This is because the permission attributes were not available
* beforehand.
*
* @param[in] obj_hdl File to open or parent directory
* @param[in,out] state state_t to use for this operation
* @param[in] openflags Mode for open
* @param[in] createmode Mode for create
* @param[in] name Name for file if being created or opened
* @param[in] attrib_set Attributes to set on created file
* @param[in] verifier Verifier to use for exclusive create
* @param[in,out] new_obj Newly created object
* @param[in,out] attrs_out Newly created object attributes
* @param[in,out] caller_perm_check The caller must do a permission check
*
* @return FSAL status.
*/
fsal_status_t gpfs_open2(struct fsal_obj_handle *obj_hdl,
struct state_t *state,
fsal_openflags_t openflags,
enum fsal_create_mode createmode,
const char *name,
struct attrlist *attrib_set,
fsal_verifier_t verifier,
struct fsal_obj_handle **new_obj,
struct attrlist *attrs_out,
bool *caller_perm_check)
{
int posix_flags = 0;
mode_t unix_mode;
fsal_status_t status = {0, 0};
struct gpfs_fd *my_fd = NULL;
struct gpfs_fsal_obj_handle *myself;
struct gpfs_fsal_obj_handle *hdl = NULL;
struct gpfs_file_handle fh;
bool truncated;
bool created = false;
struct fsal_export *export = op_ctx->fsal_export;
struct gpfs_filesystem *gpfs_fs = obj_hdl->fs->private_data;
int *fd = NULL;
myself = container_of(obj_hdl, struct gpfs_fsal_obj_handle, obj_handle);
if (name)
LogFullDebug(COMPONENT_FSAL, "got name %s", name);
else
LogFullDebug(COMPONENT_FSAL, "no name");
LogAttrlist(COMPONENT_FSAL, NIV_FULL_DEBUG,
"attrs ", attrib_set, false);
if (state != NULL)
my_fd = (struct gpfs_fd *)(state + 1);
fsal2posix_openflags(openflags, &posix_flags);
truncated = (posix_flags & O_TRUNC) != 0;
if (createmode >= FSAL_EXCLUSIVE) {
/* Now fixup attrs for verifier if exclusive create */
set_common_verifier(attrib_set, verifier);
}
if (name == NULL) {
/* This is an open by handle */
if (state != NULL) {
/* Prepare to take the share reservation, but only if we
* are called with a valid state (if state is NULL the
* caller is a stateless create such as NFS v3 CREATE).
*/
/* This can block over an I/O operation. */
PTHREAD_RWLOCK_wrlock(&obj_hdl->lock);
/* Check share reservation conflicts. */
status = check_share_conflict(&myself->u.file.share,
openflags,
false);
if (FSAL_IS_ERROR(status)) {
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
return status;
}
/* Take the share reservation now by updating the
* counters.
*/
update_share_counters(&myself->u.file.share,
FSAL_O_CLOSED,
openflags);
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
fd = &my_fd->fd;
my_fd->openflags = openflags;
} else {
/* We need to use the global fd to continue, and take
* the lock to protect it.
*/
fd = &myself->u.file.fd.fd;
myself->u.file.fd.openflags = openflags;
PTHREAD_RWLOCK_wrlock(&obj_hdl->lock);
}
status = GPFSFSAL_open(obj_hdl, op_ctx, posix_flags, fd, false);
if (FSAL_IS_ERROR(status)) {
if (state == NULL) {
/* Release the lock taken above, and return
* since there is nothing to undo.
*/
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
return status;
}
/* Error - need to release the share */
goto undo_share;
}
if (attrs_out && (createmode >= FSAL_EXCLUSIVE || truncated)) {
/* Refresh the attributes */
status = GPFSFSAL_getattrs(export, gpfs_fs, op_ctx,
myself->handle, attrs_out);
if (!FSAL_IS_ERROR(status)) {
LogFullDebug(COMPONENT_FSAL,
"New size = %"PRIx64,
attrs_out->filesize);
}
/* Now check verifier for exclusive, but not for
* FSAL_EXCLUSIVE_9P.
*/
if (!FSAL_IS_ERROR(status) &&
createmode >= FSAL_EXCLUSIVE &&
createmode != FSAL_EXCLUSIVE_9P &&
!check_verifier_attrlist(attrs_out, verifier)) {
/* Verifier didn't match, return EEXIST */
status =
fsalstat(posix2fsal_error(EEXIST), EEXIST);
}
}
if (state == NULL) {
/* If no state, release the lock taken above and return
* status.
*/
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
return status;
}
if (!FSAL_IS_ERROR(status)) {
/* Return success. */
return status;
}
(void) fsal_internal_close(*fd, state->state_owner, 0);
undo_share:
/* Can only get here with state not NULL and an error */
/* On error we need to release our share reservation
* and undo the update of the share counters.
* This can block over an I/O operation.
*/
PTHREAD_RWLOCK_wrlock(&obj_hdl->lock);
update_share_counters(&myself->u.file.share,
openflags,
FSAL_O_CLOSED);
PTHREAD_RWLOCK_unlock(&obj_hdl->lock);
return status;
}
/**
* FSAL_open:
* Open a regular file for reading/writing its data content.
*
* \param filehandle (input):
* Handle of the file to be read/modified.
* \param cred (input):
* Authentication context for the operation (user,...).
* \param openflags (input):
* Flags that indicates behavior for file opening and access.
* This is an inclusive OR of the following values
* ( such of them are not compatible) :
* - FSAL_O_RDONLY: opening file for reading only.
* - FSAL_O_RDWR: opening file for reading and writing.
* - FSAL_O_WRONLY: opening file for writting only.
* - FSAL_O_APPEND: always write at the end of the file.
* - FSAL_O_TRUNC: truncate the file to 0 on opening.
* \param file_descriptor (output):
* The file descriptor to be used for FSAL_read/write operations.
* \param file_attributes (optionnal input/output):
* Post operation attributes.
* As input, it defines the attributes that the caller
* wants to retrieve (by positioning flags into this structure)
* and the output is built considering this input
* (it fills the structure according to the flags it contains).
*
* \return Major error codes:
* - ERR_FSAL_NO_ERROR (no error)
* - ERR_FSAL_ACCESS (user doesn't have the permissions for opening the file)
* - ERR_FSAL_STALE (filehandle does not address an existing object)
* - ERR_FSAL_INVAL (filehandle does not address a regular file,
* or open flags are conflicting)
* - ERR_FSAL_FAULT (a NULL pointer was passed as mandatory argument)
* - Other error codes can be returned :
* ERR_FSAL_IO, ...
*/
fsal_status_t ZFSFSAL_open(zfsfsal_handle_t * filehandle, /* IN */
zfsfsal_op_context_t * p_context, /* IN */
fsal_openflags_t openflags, /* IN */
zfsfsal_file_t * file_descriptor, /* OUT */
fsal_attrib_list_t * file_attributes /* [ IN/OUT ] */
)
{
int rc;
/* sanity checks.
* note : file_attributes is optional.
*/
if(!filehandle || !p_context || !file_descriptor)
Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_open);
/* >> you can check if this is a file if the information
* is stored into the handle << */
if(filehandle->data.type != FSAL_TYPE_FILE)
Return(ERR_FSAL_INVAL, 0, INDEX_FSAL_open);
/* >> convert fsal open flags to your FS open flags
* Take care of conflicting flags << */
int posix_flags;
rc = fsal2posix_openflags(openflags, &posix_flags);
if(rc)
Return(rc, 0, INDEX_FSAL_open);
TakeTokenFSCall();
/* >> call your FS open function << */
libzfswrap_vnode_t *p_vnode;
rc = libzfswrap_open(p_context->export_context->p_vfs, &p_context->user_credential.cred,
filehandle->data.zfs_handle, posix_flags, &p_vnode);
ReleaseTokenFSCall();
/* >> interpret returned status << */
if(rc)
Return(posix2fsal_error(rc), rc, INDEX_FSAL_open);
/* >> fill output struct << */
file_descriptor->p_vfs = p_context->export_context->p_vfs;
file_descriptor->flags = posix_flags;
file_descriptor->current_offset = 0;
file_descriptor->p_vnode = p_vnode;
file_descriptor->zfs_handle = filehandle->data.zfs_handle;
file_descriptor->cred = p_context->user_credential.cred;
file_descriptor->is_closed = 0;
if(file_attributes)
{
fsal_status_t status = ZFSFSAL_getattrs(filehandle, p_context, file_attributes);
/* On error, we set a flag in the returned attributes */
if(FSAL_IS_ERROR(status))
{
FSAL_CLEAR_MASK(file_attributes->asked_attributes);
FSAL_SET_MASK(file_attributes->asked_attributes, FSAL_ATTR_RDATTR_ERR);
}
}
Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_open);
}
/**
* FSAL_open:
* Open a regular file for reading/writing its data content.
*
* \param filehandle (input):
* Handle of the file to be read/modified.
* \param cred (input):
* Authentication context for the operation (user,...).
* \param openflags (input):
* Flags that indicates behavior for file opening and access.
* This is an inclusive OR of the following values
* ( such of them are not compatible) :
* - FSAL_O_RDONLY: opening file for reading only.
* - FSAL_O_RDWR: opening file for reading and writing.
* - FSAL_O_WRONLY: opening file for writting only.
* - FSAL_O_APPEND: always write at the end of the file.
* - FSAL_O_TRUNC: truncate the file to 0 on opening.
* \param file_descriptor (output):
* The file descriptor to be used for FSAL_read/write operations.
* \param file_attributes (optionnal input/output):
* Post operation attributes.
* As input, it defines the attributes that the caller
* wants to retrieve (by positioning flags into this structure)
* and the output is built considering this input
* (it fills the structure according to the flags it contains).
*
* \return Major error codes:
* - ERR_FSAL_NO_ERROR: no error.
* - Another error code if an error occured during this call.
*/
fsal_status_t LUSTREFSAL_open(lustrefsal_handle_t * p_filehandle, /* IN */
lustrefsal_op_context_t * p_context, /* IN */
fsal_openflags_t openflags, /* IN */
lustrefsal_file_t * p_file_descriptor, /* OUT */
fsal_attrib_list_t * p_file_attributes /* [ IN/OUT ] */
)
{
int rc, errsv;
fsal_status_t status;
fsal_path_t fsalpath;
struct stat buffstat;
int posix_flags = 0;
/* sanity checks.
* note : file_attributes is optional.
*/
if(!p_filehandle || !p_context || !p_file_descriptor)
Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_open);
status = fsal_internal_Handle2FidPath(p_context, p_filehandle, &fsalpath);
if(FSAL_IS_ERROR(status))
ReturnStatus(status, INDEX_FSAL_open);
/* retrieve file attributes for checking access rights */
TakeTokenFSCall();
rc = lstat(fsalpath.path, &buffstat);
errsv = errno;
ReleaseTokenFSCall();
if(rc)
{
if(errsv == ENOENT)
Return(ERR_FSAL_STALE, errsv, INDEX_FSAL_open);
else
Return(posix2fsal_error(errsv), errsv, INDEX_FSAL_open);
}
status =
fsal_internal_testAccess(p_context,
openflags & FSAL_O_RDONLY ? FSAL_R_OK : FSAL_W_OK,
&buffstat, NULL);
if(FSAL_IS_ERROR(status))
ReturnStatus(status, INDEX_FSAL_open);
/* convert fsal open flags to posix open flags */
rc = fsal2posix_openflags(openflags, &posix_flags);
/* flags conflicts. */
if(rc)
{
LogEvent(COMPONENT_FSAL, "Invalid/conflicting flags : %#X",
openflags);
Return(rc, 0, INDEX_FSAL_open);
}
TakeTokenFSCall();
p_file_descriptor->fd = open(fsalpath.path, posix_flags, 0644);
errsv = errno;
ReleaseTokenFSCall();
if(p_file_descriptor->fd == -1)
Return(posix2fsal_error(errsv), errsv, INDEX_FSAL_open);
/* set the read-only flag of the file descriptor */
p_file_descriptor->ro = openflags & FSAL_O_RDONLY;
/* output attributes */
if(p_file_attributes)
{
status = posix2fsal_attributes(&buffstat, p_file_attributes);
if(FSAL_IS_ERROR(status))
{
FSAL_CLEAR_MASK(p_file_attributes->asked_attributes);
FSAL_SET_MASK(p_file_attributes->asked_attributes, FSAL_ATTR_RDATTR_ERR);
}
}
Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_open);
}
/**
* FSAL_open:
* Open a regular file for reading/writing its data content.
*
* \param filehandle (input):
* Handle of the file to be read/modified.
* \param cred (input):
* Authentication context for the operation (user,...).
* \param openflags (input):
* Flags that indicates behavior for file opening and access.
* This is an inclusive OR of the following values
* ( such of them are not compatible) :
* - FSAL_O_RDONLY: opening file for reading only.
* - FSAL_O_RDWR: opening file for reading and writing.
* - FSAL_O_WRONLY: opening file for writting only.
* - FSAL_O_APPEND: always write at the end of the file.
* - FSAL_O_TRUNC: truncate the file to 0 on opening.
* \param file_descriptor (output):
* The file descriptor to be used for FSAL_read/write operations.
* \param file_attributes (optionnal input/output):
* Post operation attributes.
* As input, it defines the attributes that the caller
* wants to retrieve (by positioning flags into this structure)
* and the output is built considering this input
* (it fills the structure according to the flags it contains).
*
* \return Major error codes:
* - ERR_FSAL_NO_ERROR (no error)
* - ERR_FSAL_ACCESS (user doesn't have the permissions for opening the file)
* - ERR_FSAL_STALE (filehandle does not address an existing object)
* - ERR_FSAL_INVAL (filehandle does not address a regular file,
* or open flags are conflicting)
* - ERR_FSAL_FAULT (a NULL pointer was passed as mandatory argument)
* - Other error codes can be returned :
* ERR_FSAL_IO, ...
*/
fsal_status_t ZFSFSAL_open(fsal_handle_t * file_hdl, /* IN */
fsal_op_context_t * p_context, /* IN */
fsal_openflags_t openflags, /* IN */
fsal_file_t * file_desc, /* OUT */
fsal_attrib_list_t * file_attributes /* [ IN/OUT ] */
)
{
int rc;
creden_t cred;
zfsfsal_handle_t * filehandle = (zfsfsal_handle_t *)file_hdl;
zfsfsal_file_t * file_descriptor = ( zfsfsal_file_t *)file_desc;
/* sanity checks.
* note : file_attributes is optional.
*/
if(!filehandle || !p_context || !file_descriptor)
Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_open);
/* Check if this is a file */
if(filehandle->data.type != FSAL_TYPE_FILE)
Return(ERR_FSAL_INVAL, 0, INDEX_FSAL_open);
/* Get the right VFS */
ZFSFSAL_VFS_RDLock();
libzfswrap_vfs_t *p_vfs = ZFSFSAL_GetVFS(filehandle);
if(!p_vfs)
{
ZFSFSAL_VFS_Unlock();
Return(ERR_FSAL_NOENT, 0, INDEX_FSAL_open);
}
/* >> convert fsal open flags to your FS open flags
* Take care of conflicting flags << */
int posix_flags;
rc = fsal2posix_openflags(openflags, &posix_flags);
if(rc)
Return(rc, 0, INDEX_FSAL_open);
cred.uid = p_context->credential.user;
cred.gid = p_context->credential.group;
TakeTokenFSCall();
/* >> call your FS open function << */
libzfswrap_vnode_t *p_vnode;
rc = libzfswrap_open(p_vfs, &cred,
filehandle->data.zfs_handle, posix_flags, &p_vnode);
ReleaseTokenFSCall();
ZFSFSAL_VFS_Unlock();
/* >> interpret returned status << */
if(rc)
Return(posix2fsal_error(rc), 0, INDEX_FSAL_open);
/* >> fill output struct << */
file_descriptor->flags = posix_flags;
file_descriptor->current_offset = 0;
file_descriptor->p_vnode = p_vnode;
file_descriptor->handle = *filehandle;
file_descriptor->cred = cred;
file_descriptor->is_closed = 0;
if(file_attributes)
{
fsal_status_t status = ZFSFSAL_getattrs(file_hdl, p_context, file_attributes);
/* On error, we set a flag in the returned attributes */
if(FSAL_IS_ERROR(status))
{
FSAL_CLEAR_MASK(file_attributes->asked_attributes);
FSAL_SET_MASK(file_attributes->asked_attributes, FSAL_ATTR_RDATTR_ERR);
}
}
Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_open);
}
/**
* FSAL_open:
* Open a regular file for reading/writing its data content.
*
* \param filehandle (input):
* Handle of the file to be read/modified.
* \param cred (input):
* Authentication context for the operation (user,...).
* \param openflags (input):
* Flags that indicates behavior for file opening and access.
* This is an inclusive OR of the following values
* ( such of them are not compatible) :
* - FSAL_O_RDONLY: opening file for reading only.
* - FSAL_O_RDWR: opening file for reading and writing.
* - FSAL_O_WRONLY: opening file for writting only.
* - FSAL_O_APPEND: always write at the end of the file.
* - FSAL_O_TRUNC: truncate the file to 0 on opening.
* \param file_descriptor (output):
* The file descriptor to be used for FSAL_read/write operations.
* \param file_attributes (optionnal input/output):
* Post operation attributes.
* As input, it defines the attributes that the caller
* wants to retrieve (by positioning flags into this structure)
* and the output is built considering this input
* (it fills the structure according to the flags it contains).
*
* \return Major error codes:
* - ERR_FSAL_NO_ERROR: no error.
* - Another error code if an error occured during this call.
*/
fsal_status_t POSIXFSAL_open(fsal_handle_t * filehandle, /* IN */
fsal_op_context_t * context, /* IN */
fsal_openflags_t openflags, /* IN */
fsal_file_t * file_descriptor, /* OUT */
fsal_attrib_list_t * p_file_attributes /* [ IN/OUT ] */
)
{
posixfsal_handle_t * p_filehandle = (posixfsal_handle_t *) filehandle;
posixfsal_op_context_t * p_context = (posixfsal_op_context_t *) context;
posixfsal_file_t * p_file_descriptor = (posixfsal_file_t *) file_descriptor;
int rc, errsv;
fsal_status_t status;
fsal_path_t fsalpath;
struct stat buffstat;
#ifdef _FSAL_POSIX_USE_STREAM
char posix_flags[4]; /* stores r, r+, w, w+, a, or a+ */
#else
int posix_flags;
#endif
/* sanity checks.
* note : file_attributes is optional.
*/
if(!p_filehandle || !p_context || !p_file_descriptor)
Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_open);
status =
fsal_internal_getPathFromHandle(p_context, p_filehandle, 0, &fsalpath, &buffstat);
if(FSAL_IS_ERROR(status))
Return(status.major, status.minor, INDEX_FSAL_open);
status =
fsal_internal_testAccess(p_context,
(openflags & FSAL_O_RDONLY ? FSAL_R_OK : FSAL_W_OK) |
FSAL_OWNER_OK, &buffstat, NULL);
if(FSAL_IS_ERROR(status))
Return(status.major, status.minor, INDEX_FSAL_open);
/* convert fsal open flags to posix open flags */
rc = fsal2posix_openflags(openflags, &posix_flags);
/* flags conflicts. */
if(rc)
{
LogEvent(COMPONENT_FSAL, "Invalid/conflicting flags : %#X", openflags);
Return(rc, 0, INDEX_FSAL_open);
}
TakeTokenFSCall();
#ifdef _FSAL_POSIX_USE_STREAM
p_file_descriptor->p_file = fopen(fsalpath.path, posix_flags);
errsv = errno;
ReleaseTokenFSCall();
if(!(p_file_descriptor->p_file))
Return(posix2fsal_error(errsv), errsv, INDEX_FSAL_open);
#else
p_file_descriptor->filefd = open(fsalpath.path, posix_flags);
errsv = errno;
ReleaseTokenFSCall();
#endif
/* set the read-only flag of the file descriptor */
p_file_descriptor->ro = openflags & FSAL_O_RDONLY;
/* output attributes */
if(p_file_attributes)
{
status = posix2fsal_attributes(&buffstat, p_file_attributes);
if(FSAL_IS_ERROR(status))
{
FSAL_CLEAR_MASK(p_file_attributes->asked_attributes);
FSAL_SET_MASK(p_file_attributes->asked_attributes, FSAL_ATTR_RDATTR_ERR);
}
}
Return(ERR_FSAL_NO_ERROR, errsv, INDEX_FSAL_open); /* use the error... */
}
/**
* FSAL_open:
* Open a regular file for reading/writing its data content.
*
* \param filehandle (input):
* Handle of the file to be read/modified.
* \param cred (input):
* Authentication context for the operation (user,...).
* \param openflags (input):
* Flags that indicates behavior for file opening and access.
* This is an inclusive OR of the following values
* ( such of them are not compatible) :
* - FSAL_O_RDONLY: opening file for reading only.
* - FSAL_O_RDWR: opening file for reading and writing.
* - FSAL_O_WRONLY: opening file for writting only.
* - FSAL_O_APPEND: always write at the end of the file.
* - FSAL_O_TRUNC: truncate the file to 0 on opening.
* \param file_descriptor (output):
* The file descriptor to be used for FSAL_read/write operations.
* \param file_attributes (optionnal input/output):
* Post operation attributes.
* As input, it defines the attributes that the caller
* wants to retrieve (by positioning flags into this structure)
* and the output is built considering this input
* (it fills the structure according to the flags it contains).
*
* \return Major error codes:
* - ERR_FSAL_NO_ERROR: no error.
* - Another error code if an error occured during this call.
*/
fsal_status_t XFSFSAL_open(fsal_handle_t * p_filehandle, /* IN */
fsal_op_context_t * p_context, /* IN */
fsal_openflags_t openflags, /* IN */
fsal_file_t * p_file_descriptor, /* OUT */
fsal_attrib_list_t * p_file_attributes /* [ IN/OUT ] */
)
{
int rc, errsv;
fsal_status_t status;
int fd = 0 ;
struct stat buffstat;
int posix_flags = 0;
/* sanity checks.
* note : file_attributes is optional.
*/
if(!p_filehandle || !p_context || !p_file_descriptor)
Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_open);
/* convert fsal open flags to posix open flags */
rc = fsal2posix_openflags(openflags, &posix_flags);
/* flags conflicts. */
if(rc)
{
LogEvent(COMPONENT_FSAL, "Invalid/conflicting flags : %#X",
openflags);
Return(rc, 0, INDEX_FSAL_open);
}
TakeTokenFSCall();
status = fsal_internal_handle2fd(p_context, p_filehandle, &fd, posix_flags);
ReleaseTokenFSCall();
if(FSAL_IS_ERROR(status))
ReturnStatus(status, INDEX_FSAL_open);
/* retrieve file attributes for checking access rights */
TakeTokenFSCall();
rc = fstat(fd, &buffstat);
errsv = errno;
ReleaseTokenFSCall();
if(rc)
{
close(fd);
if(errsv == ENOENT)
Return(ERR_FSAL_STALE, errsv, INDEX_FSAL_open);
else
Return(posix2fsal_error(errsv), errsv, INDEX_FSAL_open);
}
#if 0
/* No required, the open would have failed if not permitted */
status =
fsal_check_access(p_context,
openflags & FSAL_O_RDONLY ? FSAL_R_OK : FSAL_W_OK,
&buffstat, NULL);
if(FSAL_IS_ERROR(status))
{
close(fd);
ReturnStatus(status, INDEX_FSAL_open);
}
#endif
TakeTokenFSCall();
((xfsfsal_file_t *)p_file_descriptor)->fd = fd;
errsv = errno;
ReleaseTokenFSCall();
/* set the read-only flag of the file descriptor */
((xfsfsal_file_t *)p_file_descriptor)->ro = openflags & FSAL_O_RDONLY;
/* output attributes */
if(p_file_attributes)
{
status = posix2fsal_attributes(&buffstat, p_file_attributes);
if(FSAL_IS_ERROR(status))
{
FSAL_CLEAR_MASK(p_file_attributes->asked_attributes);
FSAL_SET_MASK(p_file_attributes->asked_attributes, FSAL_ATTR_RDATTR_ERR);
}
}
Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_open);
}
/**
* FSAL_open:
* Open a regular file for reading/writing its data content.
*
* \param filehandle (input):
* Handle of the file to be read/modified.
* \param cred (input):
* Authentication context for the operation (user,...).
* \param openflags (input):
* Flags that indicates behavior for file opening and access.
* This is an inclusive OR of the following values
* ( such of them are not compatible) :
* - FSAL_O_RDONLY: opening file for reading only.
* - FSAL_O_RDWR: opening file for reading and writing.
* - FSAL_O_WRONLY: opening file for writting only.
* - FSAL_O_APPEND: always write at the end of the file.
* - FSAL_O_TRUNC: truncate the file to 0 on opening.
* \param file_descriptor (output):
* The file descriptor to be used for FSAL_read/write operations.
* \param file_attributes (optionnal input/output):
* Post operation attributes.
* As input, it defines the attributes that the caller
* wants to retrieve (by positioning flags into this structure)
* and the output is built considering this input
* (it fills the structure according to the flags it contains).
*
* \return Major error codes:
* - ERR_FSAL_NO_ERROR: no error.
* - Another error code if an error occured during this call.
*/
fsal_status_t GPFSFSAL_open(fsal_handle_t * p_filehandle, /* IN */
fsal_op_context_t * p_context, /* IN */
fsal_openflags_t openflags, /* IN */
fsal_file_t * file_desc, /* OUT */
fsal_attrib_list_t * p_file_attributes /* [ IN/OUT ] */
)
{
int rc, errsv;
fsal_status_t status;
int fd;
int posix_flags = 0;
fsal_accessflags_t access_mask = 0;
fsal_attrib_list_t file_attrs;
gpfsfsal_file_t * p_file_descriptor = (gpfsfsal_file_t *)file_desc;
/* sanity checks.
* note : file_attributes is optional.
*/
if(!p_filehandle || !p_context || !p_file_descriptor)
Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_open);
/* convert fsal open flags to posix open flags */
rc = fsal2posix_openflags(openflags, &posix_flags);
/* flags conflicts. */
if(rc)
{
LogWarn(COMPONENT_FSAL, "Invalid/conflicting flags : %#X", openflags);
Return(rc, 0, INDEX_FSAL_open);
}
TakeTokenFSCall();
status = fsal_internal_handle2fd(p_context, p_filehandle, &fd, posix_flags);
ReleaseTokenFSCall();
if(FSAL_IS_ERROR(status))
ReturnStatus(status, INDEX_FSAL_open);
/* retrieve file attributes for checking access rights */
file_attrs.asked_attributes = GPFS_SUPPORTED_ATTRIBUTES;
status = GPFSFSAL_getattrs(p_filehandle, p_context, &file_attrs);
if(FSAL_IS_ERROR(status))
ReturnStatus(status, INDEX_FSAL_open);
/* Set both mode and ace4 mask */
if(openflags & FSAL_O_RDONLY)
access_mask = FSAL_MODE_MASK_SET(FSAL_R_OK | FSAL_OWNER_OK) |
FSAL_ACE4_MASK_SET(FSAL_ACE_PERM_READ_DATA);
else
access_mask = FSAL_MODE_MASK_SET(FSAL_W_OK | FSAL_OWNER_OK) |
FSAL_ACE4_MASK_SET(FSAL_ACE_PERM_WRITE_DATA | FSAL_ACE_PERM_APPEND_DATA);
status = fsal_internal_testAccess(p_context, access_mask, NULL, &file_attrs);
if(FSAL_IS_ERROR(status))
{
close(fd);
ReturnStatus(status, INDEX_FSAL_open);
}
TakeTokenFSCall();
p_file_descriptor->fd = fd;
errsv = errno;
ReleaseTokenFSCall();
/* set the read-only flag of the file descriptor */
p_file_descriptor->ro = openflags & FSAL_O_RDONLY;
/* output attributes */
if(p_file_attributes)
*p_file_attributes = file_attrs;
Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_open);
}
