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linux-next/fs/ceph/xattr.c
Alex Elder eb78808446 ceph: use macros to normalize vxattr table definitions
Entries in the ceph virtual extended attribute tables all follow a
distinct pattern in their definition.  Enforce this pattern through
the use of a macro.

Also, a null name field signals the end of the table, so make that
be the first field in the ceph_vxattr_cb structure.

Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
2012-03-22 10:47:46 -05:00

894 lines
21 KiB
C

#include <linux/ceph/ceph_debug.h>
#include "super.h"
#include "mds_client.h"
#include <linux/ceph/decode.h>
#include <linux/xattr.h>
#include <linux/slab.h>
#define XATTR_CEPH_PREFIX "ceph."
#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
static bool ceph_is_valid_xattr(const char *name)
{
return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
!strncmp(name, XATTR_SECURITY_PREFIX,
XATTR_SECURITY_PREFIX_LEN) ||
!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
}
/*
* These define virtual xattrs exposing the recursive directory
* statistics and layout metadata.
*/
struct ceph_vxattr_cb {
char *name;
size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
size_t size);
bool readonly;
};
/* directories */
static size_t ceph_vxattrcb_entries(struct ceph_inode_info *ci, char *val,
size_t size)
{
return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
}
static size_t ceph_vxattrcb_files(struct ceph_inode_info *ci, char *val,
size_t size)
{
return snprintf(val, size, "%lld", ci->i_files);
}
static size_t ceph_vxattrcb_subdirs(struct ceph_inode_info *ci, char *val,
size_t size)
{
return snprintf(val, size, "%lld", ci->i_subdirs);
}
static size_t ceph_vxattrcb_rentries(struct ceph_inode_info *ci, char *val,
size_t size)
{
return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
}
static size_t ceph_vxattrcb_rfiles(struct ceph_inode_info *ci, char *val,
size_t size)
{
return snprintf(val, size, "%lld", ci->i_rfiles);
}
static size_t ceph_vxattrcb_rsubdirs(struct ceph_inode_info *ci, char *val,
size_t size)
{
return snprintf(val, size, "%lld", ci->i_rsubdirs);
}
static size_t ceph_vxattrcb_rbytes(struct ceph_inode_info *ci, char *val,
size_t size)
{
return snprintf(val, size, "%lld", ci->i_rbytes);
}
static size_t ceph_vxattrcb_rctime(struct ceph_inode_info *ci, char *val,
size_t size)
{
return snprintf(val, size, "%ld.%ld", (long)ci->i_rctime.tv_sec,
(long)ci->i_rctime.tv_nsec);
}
#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
#define XATTR_NAME_CEPH(_type, _name) \
{ \
.name = CEPH_XATTR_NAME(_type, _name), \
.getxattr_cb = ceph_vxattrcb_ ## _name, \
.readonly = true, \
}
static struct ceph_vxattr_cb ceph_dir_vxattrs[] = {
XATTR_NAME_CEPH(dir, entries),
XATTR_NAME_CEPH(dir, files),
XATTR_NAME_CEPH(dir, subdirs),
XATTR_NAME_CEPH(dir, rentries),
XATTR_NAME_CEPH(dir, rfiles),
XATTR_NAME_CEPH(dir, rsubdirs),
XATTR_NAME_CEPH(dir, rbytes),
XATTR_NAME_CEPH(dir, rctime),
{ 0 } /* Required table terminator */
};
/* files */
static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
size_t size)
{
int ret;
ret = snprintf(val, size,
"chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n",
(unsigned long long)ceph_file_layout_su(ci->i_layout),
(unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
(unsigned long long)ceph_file_layout_object_size(ci->i_layout));
if (ceph_file_layout_pg_preferred(ci->i_layout))
ret += snprintf(val + ret, size, "preferred_osd=%lld\n",
(unsigned long long)ceph_file_layout_pg_preferred(
ci->i_layout));
return ret;
}
static struct ceph_vxattr_cb ceph_file_vxattrs[] = {
XATTR_NAME_CEPH(file, layout),
/* The following extended attribute name is deprecated */
{
.name = XATTR_CEPH_PREFIX "layout",
.getxattr_cb = ceph_vxattrcb_layout,
.readonly = true,
},
{ 0 } /* Required table terminator */
};
static struct ceph_vxattr_cb *ceph_inode_vxattrs(struct inode *inode)
{
if (S_ISDIR(inode->i_mode))
return ceph_dir_vxattrs;
else if (S_ISREG(inode->i_mode))
return ceph_file_vxattrs;
return NULL;
}
static struct ceph_vxattr_cb *ceph_match_vxattr(struct inode *inode,
const char *name)
{
struct ceph_vxattr_cb *vxattr = ceph_inode_vxattrs(inode);
if (vxattr) {
while (vxattr->name) {
if (!strcmp(vxattr->name, name))
return vxattr;
vxattr++;
}
}
return NULL;
}
static int __set_xattr(struct ceph_inode_info *ci,
const char *name, int name_len,
const char *val, int val_len,
int dirty,
int should_free_name, int should_free_val,
struct ceph_inode_xattr **newxattr)
{
struct rb_node **p;
struct rb_node *parent = NULL;
struct ceph_inode_xattr *xattr = NULL;
int c;
int new = 0;
p = &ci->i_xattrs.index.rb_node;
while (*p) {
parent = *p;
xattr = rb_entry(parent, struct ceph_inode_xattr, node);
c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
if (c < 0)
p = &(*p)->rb_left;
else if (c > 0)
p = &(*p)->rb_right;
else {
if (name_len == xattr->name_len)
break;
else if (name_len < xattr->name_len)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
xattr = NULL;
}
if (!xattr) {
new = 1;
xattr = *newxattr;
xattr->name = name;
xattr->name_len = name_len;
xattr->should_free_name = should_free_name;
ci->i_xattrs.count++;
dout("__set_xattr count=%d\n", ci->i_xattrs.count);
} else {
kfree(*newxattr);
*newxattr = NULL;
if (xattr->should_free_val)
kfree((void *)xattr->val);
if (should_free_name) {
kfree((void *)name);
name = xattr->name;
}
ci->i_xattrs.names_size -= xattr->name_len;
ci->i_xattrs.vals_size -= xattr->val_len;
}
ci->i_xattrs.names_size += name_len;
ci->i_xattrs.vals_size += val_len;
if (val)
xattr->val = val;
else
xattr->val = "";
xattr->val_len = val_len;
xattr->dirty = dirty;
xattr->should_free_val = (val && should_free_val);
if (new) {
rb_link_node(&xattr->node, parent, p);
rb_insert_color(&xattr->node, &ci->i_xattrs.index);
dout("__set_xattr_val p=%p\n", p);
}
dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
return 0;
}
static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
const char *name)
{
struct rb_node **p;
struct rb_node *parent = NULL;
struct ceph_inode_xattr *xattr = NULL;
int name_len = strlen(name);
int c;
p = &ci->i_xattrs.index.rb_node;
while (*p) {
parent = *p;
xattr = rb_entry(parent, struct ceph_inode_xattr, node);
c = strncmp(name, xattr->name, xattr->name_len);
if (c == 0 && name_len > xattr->name_len)
c = 1;
if (c < 0)
p = &(*p)->rb_left;
else if (c > 0)
p = &(*p)->rb_right;
else {
dout("__get_xattr %s: found %.*s\n", name,
xattr->val_len, xattr->val);
return xattr;
}
}
dout("__get_xattr %s: not found\n", name);
return NULL;
}
static void __free_xattr(struct ceph_inode_xattr *xattr)
{
BUG_ON(!xattr);
if (xattr->should_free_name)
kfree((void *)xattr->name);
if (xattr->should_free_val)
kfree((void *)xattr->val);
kfree(xattr);
}
static int __remove_xattr(struct ceph_inode_info *ci,
struct ceph_inode_xattr *xattr)
{
if (!xattr)
return -EOPNOTSUPP;
rb_erase(&xattr->node, &ci->i_xattrs.index);
if (xattr->should_free_name)
kfree((void *)xattr->name);
if (xattr->should_free_val)
kfree((void *)xattr->val);
ci->i_xattrs.names_size -= xattr->name_len;
ci->i_xattrs.vals_size -= xattr->val_len;
ci->i_xattrs.count--;
kfree(xattr);
return 0;
}
static int __remove_xattr_by_name(struct ceph_inode_info *ci,
const char *name)
{
struct rb_node **p;
struct ceph_inode_xattr *xattr;
int err;
p = &ci->i_xattrs.index.rb_node;
xattr = __get_xattr(ci, name);
err = __remove_xattr(ci, xattr);
return err;
}
static char *__copy_xattr_names(struct ceph_inode_info *ci,
char *dest)
{
struct rb_node *p;
struct ceph_inode_xattr *xattr = NULL;
p = rb_first(&ci->i_xattrs.index);
dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
while (p) {
xattr = rb_entry(p, struct ceph_inode_xattr, node);
memcpy(dest, xattr->name, xattr->name_len);
dest[xattr->name_len] = '\0';
dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
xattr->name_len, ci->i_xattrs.names_size);
dest += xattr->name_len + 1;
p = rb_next(p);
}
return dest;
}
void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
{
struct rb_node *p, *tmp;
struct ceph_inode_xattr *xattr = NULL;
p = rb_first(&ci->i_xattrs.index);
dout("__ceph_destroy_xattrs p=%p\n", p);
while (p) {
xattr = rb_entry(p, struct ceph_inode_xattr, node);
tmp = p;
p = rb_next(tmp);
dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
xattr->name_len, xattr->name);
rb_erase(tmp, &ci->i_xattrs.index);
__free_xattr(xattr);
}
ci->i_xattrs.names_size = 0;
ci->i_xattrs.vals_size = 0;
ci->i_xattrs.index_version = 0;
ci->i_xattrs.count = 0;
ci->i_xattrs.index = RB_ROOT;
}
static int __build_xattrs(struct inode *inode)
__releases(ci->i_ceph_lock)
__acquires(ci->i_ceph_lock)
{
u32 namelen;
u32 numattr = 0;
void *p, *end;
u32 len;
const char *name, *val;
struct ceph_inode_info *ci = ceph_inode(inode);
int xattr_version;
struct ceph_inode_xattr **xattrs = NULL;
int err = 0;
int i;
dout("__build_xattrs() len=%d\n",
ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
return 0; /* already built */
__ceph_destroy_xattrs(ci);
start:
/* updated internal xattr rb tree */
if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
p = ci->i_xattrs.blob->vec.iov_base;
end = p + ci->i_xattrs.blob->vec.iov_len;
ceph_decode_32_safe(&p, end, numattr, bad);
xattr_version = ci->i_xattrs.version;
spin_unlock(&ci->i_ceph_lock);
xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *),
GFP_NOFS);
err = -ENOMEM;
if (!xattrs)
goto bad_lock;
memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *));
for (i = 0; i < numattr; i++) {
xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
GFP_NOFS);
if (!xattrs[i])
goto bad_lock;
}
spin_lock(&ci->i_ceph_lock);
if (ci->i_xattrs.version != xattr_version) {
/* lost a race, retry */
for (i = 0; i < numattr; i++)
kfree(xattrs[i]);
kfree(xattrs);
goto start;
}
err = -EIO;
while (numattr--) {
ceph_decode_32_safe(&p, end, len, bad);
namelen = len;
name = p;
p += len;
ceph_decode_32_safe(&p, end, len, bad);
val = p;
p += len;
err = __set_xattr(ci, name, namelen, val, len,
0, 0, 0, &xattrs[numattr]);
if (err < 0)
goto bad;
}
kfree(xattrs);
}
ci->i_xattrs.index_version = ci->i_xattrs.version;
ci->i_xattrs.dirty = false;
return err;
bad_lock:
spin_lock(&ci->i_ceph_lock);
bad:
if (xattrs) {
for (i = 0; i < numattr; i++)
kfree(xattrs[i]);
kfree(xattrs);
}
ci->i_xattrs.names_size = 0;
return err;
}
static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
int val_size)
{
/*
* 4 bytes for the length, and additional 4 bytes per each xattr name,
* 4 bytes per each value
*/
int size = 4 + ci->i_xattrs.count*(4 + 4) +
ci->i_xattrs.names_size +
ci->i_xattrs.vals_size;
dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
ci->i_xattrs.count, ci->i_xattrs.names_size,
ci->i_xattrs.vals_size);
if (name_size)
size += 4 + 4 + name_size + val_size;
return size;
}
/*
* If there are dirty xattrs, reencode xattrs into the prealloc_blob
* and swap into place.
*/
void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
{
struct rb_node *p;
struct ceph_inode_xattr *xattr = NULL;
void *dest;
dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
if (ci->i_xattrs.dirty) {
int need = __get_required_blob_size(ci, 0, 0);
BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
p = rb_first(&ci->i_xattrs.index);
dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
ceph_encode_32(&dest, ci->i_xattrs.count);
while (p) {
xattr = rb_entry(p, struct ceph_inode_xattr, node);
ceph_encode_32(&dest, xattr->name_len);
memcpy(dest, xattr->name, xattr->name_len);
dest += xattr->name_len;
ceph_encode_32(&dest, xattr->val_len);
memcpy(dest, xattr->val, xattr->val_len);
dest += xattr->val_len;
p = rb_next(p);
}
/* adjust buffer len; it may be larger than we need */
ci->i_xattrs.prealloc_blob->vec.iov_len =
dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
if (ci->i_xattrs.blob)
ceph_buffer_put(ci->i_xattrs.blob);
ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
ci->i_xattrs.prealloc_blob = NULL;
ci->i_xattrs.dirty = false;
ci->i_xattrs.version++;
}
}
ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
size_t size)
{
struct inode *inode = dentry->d_inode;
struct ceph_inode_info *ci = ceph_inode(inode);
int err;
struct ceph_inode_xattr *xattr;
struct ceph_vxattr_cb *vxattr = NULL;
if (!ceph_is_valid_xattr(name))
return -ENODATA;
/* let's see if a virtual xattr was requested */
vxattr = ceph_match_vxattr(inode, name);
spin_lock(&ci->i_ceph_lock);
dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
ci->i_xattrs.version, ci->i_xattrs.index_version);
if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
(ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
goto get_xattr;
} else {
spin_unlock(&ci->i_ceph_lock);
/* get xattrs from mds (if we don't already have them) */
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
if (err)
return err;
}
spin_lock(&ci->i_ceph_lock);
if (vxattr && vxattr->readonly) {
err = vxattr->getxattr_cb(ci, value, size);
goto out;
}
err = __build_xattrs(inode);
if (err < 0)
goto out;
get_xattr:
err = -ENODATA; /* == ENOATTR */
xattr = __get_xattr(ci, name);
if (!xattr) {
if (vxattr)
err = vxattr->getxattr_cb(ci, value, size);
goto out;
}
err = -ERANGE;
if (size && size < xattr->val_len)
goto out;
err = xattr->val_len;
if (size == 0)
goto out;
memcpy(value, xattr->val, xattr->val_len);
out:
spin_unlock(&ci->i_ceph_lock);
return err;
}
ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
{
struct inode *inode = dentry->d_inode;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
u32 vir_namelen = 0;
u32 namelen;
int err;
u32 len;
int i;
spin_lock(&ci->i_ceph_lock);
dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
ci->i_xattrs.version, ci->i_xattrs.index_version);
if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
(ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
goto list_xattr;
} else {
spin_unlock(&ci->i_ceph_lock);
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
if (err)
return err;
}
spin_lock(&ci->i_ceph_lock);
err = __build_xattrs(inode);
if (err < 0)
goto out;
list_xattr:
vir_namelen = 0;
/* include virtual dir xattrs */
if (vxattrs)
for (i = 0; vxattrs[i].name; i++)
vir_namelen += strlen(vxattrs[i].name) + 1;
/* adding 1 byte per each variable due to the null termination */
namelen = vir_namelen + ci->i_xattrs.names_size + ci->i_xattrs.count;
err = -ERANGE;
if (size && namelen > size)
goto out;
err = namelen;
if (size == 0)
goto out;
names = __copy_xattr_names(ci, names);
/* virtual xattr names, too */
if (vxattrs)
for (i = 0; vxattrs[i].name; i++) {
len = sprintf(names, "%s", vxattrs[i].name);
names += len + 1;
}
out:
spin_unlock(&ci->i_ceph_lock);
return err;
}
static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
const char *value, size_t size, int flags)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
struct inode *inode = dentry->d_inode;
struct ceph_inode_info *ci = ceph_inode(inode);
struct inode *parent_inode;
struct ceph_mds_request *req;
struct ceph_mds_client *mdsc = fsc->mdsc;
int err;
int i, nr_pages;
struct page **pages = NULL;
void *kaddr;
/* copy value into some pages */
nr_pages = calc_pages_for(0, size);
if (nr_pages) {
pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
if (!pages)
return -ENOMEM;
err = -ENOMEM;
for (i = 0; i < nr_pages; i++) {
pages[i] = __page_cache_alloc(GFP_NOFS);
if (!pages[i]) {
nr_pages = i;
goto out;
}
kaddr = kmap(pages[i]);
memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
}
}
dout("setxattr value=%.*s\n", (int)size, value);
/* do request */
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
USE_AUTH_MDS);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out;
}
req->r_inode = inode;
ihold(inode);
req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
req->r_num_caps = 1;
req->r_args.setxattr.flags = cpu_to_le32(flags);
req->r_path2 = kstrdup(name, GFP_NOFS);
req->r_pages = pages;
req->r_num_pages = nr_pages;
req->r_data_len = size;
dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
parent_inode = ceph_get_dentry_parent_inode(dentry);
err = ceph_mdsc_do_request(mdsc, parent_inode, req);
iput(parent_inode);
ceph_mdsc_put_request(req);
dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
out:
if (pages) {
for (i = 0; i < nr_pages; i++)
__free_page(pages[i]);
kfree(pages);
}
return err;
}
int ceph_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = dentry->d_inode;
struct ceph_vxattr_cb *vxattr;
struct ceph_inode_info *ci = ceph_inode(inode);
int err;
int name_len = strlen(name);
int val_len = size;
char *newname = NULL;
char *newval = NULL;
struct ceph_inode_xattr *xattr = NULL;
int issued;
int required_blob_size;
int dirty;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
vxattr = ceph_match_vxattr(inode, name);
if (vxattr && vxattr->readonly)
return -EOPNOTSUPP;
/* preallocate memory for xattr name, value, index node */
err = -ENOMEM;
newname = kmemdup(name, name_len + 1, GFP_NOFS);
if (!newname)
goto out;
if (val_len) {
newval = kmemdup(value, val_len, GFP_NOFS);
if (!newval)
goto out;
}
xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
if (!xattr)
goto out;
spin_lock(&ci->i_ceph_lock);
retry:
issued = __ceph_caps_issued(ci, NULL);
if (!(issued & CEPH_CAP_XATTR_EXCL))
goto do_sync;
__build_xattrs(inode);
required_blob_size = __get_required_blob_size(ci, name_len, val_len);
if (!ci->i_xattrs.prealloc_blob ||
required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
struct ceph_buffer *blob = NULL;
spin_unlock(&ci->i_ceph_lock);
dout(" preaallocating new blob size=%d\n", required_blob_size);
blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
if (!blob)
goto out;
spin_lock(&ci->i_ceph_lock);
if (ci->i_xattrs.prealloc_blob)
ceph_buffer_put(ci->i_xattrs.prealloc_blob);
ci->i_xattrs.prealloc_blob = blob;
goto retry;
}
dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
err = __set_xattr(ci, newname, name_len, newval,
val_len, 1, 1, 1, &xattr);
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
ci->i_xattrs.dirty = true;
inode->i_ctime = CURRENT_TIME;
spin_unlock(&ci->i_ceph_lock);
if (dirty)
__mark_inode_dirty(inode, dirty);
return err;
do_sync:
spin_unlock(&ci->i_ceph_lock);
err = ceph_sync_setxattr(dentry, name, value, size, flags);
out:
kfree(newname);
kfree(newval);
kfree(xattr);
return err;
}
static int ceph_send_removexattr(struct dentry *dentry, const char *name)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
struct inode *inode = dentry->d_inode;
struct inode *parent_inode;
struct ceph_mds_request *req;
int err;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
USE_AUTH_MDS);
if (IS_ERR(req))
return PTR_ERR(req);
req->r_inode = inode;
ihold(inode);
req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
req->r_num_caps = 1;
req->r_path2 = kstrdup(name, GFP_NOFS);
parent_inode = ceph_get_dentry_parent_inode(dentry);
err = ceph_mdsc_do_request(mdsc, parent_inode, req);
iput(parent_inode);
ceph_mdsc_put_request(req);
return err;
}
int ceph_removexattr(struct dentry *dentry, const char *name)
{
struct inode *inode = dentry->d_inode;
struct ceph_vxattr_cb *vxattr;
struct ceph_inode_info *ci = ceph_inode(inode);
int issued;
int err;
int required_blob_size;
int dirty;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
vxattr = ceph_match_vxattr(inode, name);
if (vxattr && vxattr->readonly)
return -EOPNOTSUPP;
err = -ENOMEM;
spin_lock(&ci->i_ceph_lock);
__build_xattrs(inode);
retry:
issued = __ceph_caps_issued(ci, NULL);
dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
if (!(issued & CEPH_CAP_XATTR_EXCL))
goto do_sync;
required_blob_size = __get_required_blob_size(ci, 0, 0);
if (!ci->i_xattrs.prealloc_blob ||
required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
struct ceph_buffer *blob;
spin_unlock(&ci->i_ceph_lock);
dout(" preaallocating new blob size=%d\n", required_blob_size);
blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
if (!blob)
goto out;
spin_lock(&ci->i_ceph_lock);
if (ci->i_xattrs.prealloc_blob)
ceph_buffer_put(ci->i_xattrs.prealloc_blob);
ci->i_xattrs.prealloc_blob = blob;
goto retry;
}
err = __remove_xattr_by_name(ceph_inode(inode), name);
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
ci->i_xattrs.dirty = true;
inode->i_ctime = CURRENT_TIME;
spin_unlock(&ci->i_ceph_lock);
if (dirty)
__mark_inode_dirty(inode, dirty);
return err;
do_sync:
spin_unlock(&ci->i_ceph_lock);
err = ceph_send_removexattr(dentry, name);
out:
return err;
}