- 根目录:
- fs
- ceph
- inode.c
#include <linux/ceph/ceph_debug.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <linux/namei.h>
#include <linux/writeback.h>
#include <linux/vmalloc.h>
#include <linux/pagevec.h>
#include "super.h"
#include "mds_client.h"
#include <linux/ceph/decode.h>
/*
* Ceph inode operations
*
* Implement basic inode helpers (get, alloc) and inode ops (getattr,
* setattr, etc.), xattr helpers, and helpers for assimilating
* metadata returned by the MDS into our cache.
*
* Also define helpers for doing asynchronous writeback, invalidation,
* and truncation for the benefit of those who can't afford to block
* (typically because they are in the message handler path).
*/
static const struct inode_operations ceph_symlink_iops;
static void ceph_invalidate_work(struct work_struct *work);
static void ceph_writeback_work(struct work_struct *work);
static void ceph_vmtruncate_work(struct work_struct *work);
/*
* find or create an inode, given the ceph ino number
*/
static int ceph_set_ino_cb(struct inode *inode, void *data)
{
ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
return 0;
}
struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
{
struct inode *inode;
ino_t t = ceph_vino_to_ino(vino);
inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
if (inode == NULL)
return ERR_PTR(-ENOMEM);
if (inode->i_state & I_NEW) {
dout("get_inode created new inode %p %llx.%llx ino %llx\n",
inode, ceph_vinop(inode), (u64)inode->i_ino);
unlock_new_inode(inode);
}
dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
vino.snap, inode);
return inode;
}
/*
* get/constuct snapdir inode for a given directory
*/
struct inode *ceph_get_snapdir(struct inode *parent)
{
struct ceph_vino vino = {
.ino = ceph_ino(parent),
.snap = CEPH_SNAPDIR,
};
struct inode *inode = ceph_get_inode(parent->i_sb, vino);
struct ceph_inode_info *ci = ceph_inode(inode);
BUG_ON(!S_ISDIR(parent->i_mode));
if (IS_ERR(inode))
return inode;
inode->i_mode = parent->i_mode;
inode->i_uid = parent->i_uid;
inode->i_gid = parent->i_gid;
inode->i_op = &ceph_dir_iops;
inode->i_fop = &ceph_dir_fops;
ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
ci->i_rbytes = 0;
return inode;
}
const struct inode_operations ceph_file_iops = {
.permission = ceph_permission,
.setattr = ceph_setattr,
.getattr = ceph_getattr,
.setxattr = ceph_setxattr,
.getxattr = ceph_getxattr,
.listxattr = ceph_listxattr,
.removexattr = ceph_removexattr,
};
/*
* We use a 'frag tree' to keep track of the MDS's directory fragments
* for a given inode (usually there is just a single fragment). We
* need to know when a child frag is delegated to a new MDS, or when
* it is flagged as replicated, so we can direct our requests
* accordingly.
*/
/*
* find/create a frag in the tree
*/
static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
u32 f)
{
struct rb_node **p;
struct rb_node *parent = NULL;
struct ceph_inode_frag *frag;
int c;
p = &ci->i_fragtree.rb_node;
while (*p) {
parent = *p;
frag = rb_entry(parent, struct ceph_inode_frag, node);
c = ceph_frag_compare(f, frag->frag);
if (c < 0)
p = &(*p)->rb_left;
else if (c > 0)
p = &(*p)->rb_right;
else
return frag;
}
frag = kmalloc(sizeof(*frag), GFP_NOFS);
if (!frag) {
pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
"frag %x\n", &ci->vfs_inode,
ceph_vinop(&ci->vfs_inode), f);
return ERR_PTR(-ENOMEM);
}
frag->frag = f;
frag->split_by = 0;
frag->mds = -1;
frag->ndist = 0;
rb_link_node(&frag->node, parent, p);
rb_insert_color(&frag->node, &ci->i_fragtree);
dout("get_or_create_frag added %llx.%llx frag %x\n",
ceph_vinop(&ci->vfs_inode), f);
return frag;
}
/*
* find a specific frag @f
*/
struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
{
struct rb_node *n = ci->i_fragtree.rb_node;
while (n) {
struct ceph_inode_frag *frag =
rb_entry(n, struct ceph_inode_frag, node);
int c = ceph_frag_compare(f, frag->frag);
if (c < 0)
n = n->rb_left;
else if (c > 0)
n = n->rb_right;
else
return frag;
}
return NULL;
}
/*
* Choose frag containing the given value @v. If @pfrag is
* specified, copy the frag delegation info to the caller if
* it is present.
*/
u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
struct ceph_inode_frag *pfrag,
int *found)
{
u32 t = ceph_frag_make(0, 0);
struct ceph_inode_frag *frag;
unsigned nway, i;
u32 n;
if (found)
*found = 0;
mutex_lock(&ci->i_fragtree_mutex);
while (1) {
WARN_ON(!ceph_frag_contains_value(t, v));
frag = __ceph_find_frag(ci, t);
if (!frag)
break; /* t is a leaf */
if (frag->split_by == 0) {
if (pfrag)
memcpy(pfrag, frag, sizeof(*pfrag));
if (found)
*found = 1;
break;
}
/* choose child */
nway = 1 << frag->split_by;
dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
frag->split_by, nway);
for (i = 0; i < nway; i++) {
n = ceph_frag_make_child(t, frag->split_by, i);
if (ceph_frag_contains_value(n, v)) {
t = n;
break;
}
}
BUG_ON(i == nway);
}
dout("choose_frag(%x) = %x\n", v, t);
mutex_unlock(&ci->i_fragtree_mutex);
return t;
}
/*
* Process dirfrag (delegation) info from the mds. Include leaf
* fragment in tree ONLY if ndist > 0. Otherwise, only
* branches/splits are included in i_fragtree)
*/
static int ceph_fill_dirfrag(struct inode *inode,
struct ceph_mds_reply_dirfrag *dirinfo)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_inode_frag *frag;
u32 id = le32_to_cpu(dirinfo->frag);
int mds = le32_to_cpu(dirinfo->auth);
int ndist = le32_to_cpu(dirinfo->ndist);
int i;
int err = 0;
mutex_lock(&ci->i_fragtree_mutex);
if (ndist == 0) {
/* no delegation info needed. */
frag = __ceph_find_frag(ci, id);
if (!frag)
goto out;
if (frag->split_by == 0) {
/* tree leaf, remove */
dout("fill_dirfrag removed %llx.%llx frag %x"
" (no ref)\n", ceph_vinop(inode), id);
rb_erase(&frag->node, &ci->i_fragtree);
kfree(frag);
} else {
/* tree branch, keep and clear */
dout("fill_dirfrag cleared %llx.%llx frag %x"
" referral\n", ceph_vinop(inode), id);
frag->mds = -1;
frag->ndist = 0;
}
goto out;
}
/* find/add this frag to store mds delegation info */
frag = __get_or_create_frag(ci, id);
if (IS_ERR(frag)) {
/* this is not the end of the world; we can continue
with bad/inaccurate delegation info */
pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
err = -ENOMEM;
goto out;
}
frag->mds = mds;
frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
for (i = 0; i < frag->ndist; i++)
frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
ceph_vinop(inode), frag->frag, frag->ndist);
out:
mutex_unlock(&ci->i_fragtree_mutex);
return err;
}
/*
* initialize a newly allocated inode.
*/
struct inode *ceph_alloc_inode(struct super_block *sb)
{
struct ceph_inode_info *ci;
int i;
ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
if (!ci)
return NULL;
dout("alloc_inode %p\n", &ci->vfs_inode);
ci->i_version = 0;
ci->i_time_warp_seq = 0;
ci->i_ceph_flags = 0;
ci->i_release_count = 0;
ci->i_symlink = NULL;
memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
ci->i_fragtree = RB_ROOT;
mutex_init(&ci->i_fragtree_mutex);
ci->i_xattrs.blob = NULL;
ci->i_xattrs.prealloc_blob = NULL;
ci->i_xattrs.dirty = false;
ci->i_xattrs.index = RB_ROOT;
ci->i_xattrs.count = 0;
ci->i_xattrs.names_size = 0;
ci->i_xattrs.vals_size = 0;
ci->i_xattrs.version = 0;
ci->i_xattrs.index_version = 0;
ci->i_caps = RB_ROOT;
ci->i_auth_cap = NULL;
ci->i_dirty_caps = 0;
ci->i_flushing_caps = 0;
INIT_LIST_HEAD(&ci->i_dirty_item);
INIT_LIST_HEAD(&ci->i_flushing_item);
ci->i_cap_flush_seq = 0;
ci->i_cap_flush_last_tid = 0;
memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
init_waitqueue_head(&ci->i_cap_wq);
ci->i_hold_caps_min = 0;
ci->i_hold_caps_max = 0;
INIT_LIST_HEAD(&ci->i_cap_delay_list);
ci->i_cap_exporting_mds = 0;
ci->i_cap_exporting_mseq = 0;
ci->i_cap_exporting_issued = 0;
INIT_LIST_HEAD(&ci->i_cap_snaps);
ci->i_head_snapc = NULL;
ci->i_snap_caps = 0;
for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
ci->i_nr_by_mode[i] = 0;
ci->i_truncate_seq = 0;
ci->i_truncate_size = 0;
ci->i_truncate_pending = 0;
ci->i_max_size = 0;
ci->i_reported_size = 0;
ci->i_wanted_max_size = 0;
ci->i_requested_max_size = 0;
ci->i_pin_ref = 0;
ci->i_rd_ref = 0;
ci->i_rdcache_ref = 0;
ci->i_wr_ref = 0;
ci->i_wb_ref = 0;
ci->i_wrbuffer_ref = 0;
ci->i_wrbuffer_ref_head = 0;
ci->i_shared_gen = 0;
ci->i_rdcache_gen = 0;
ci->i_rdcache_revoking = 0;
INIT_LIST_HEAD(&ci->i_unsafe_writes);
INIT_LIST_HEAD(&ci->i_unsafe_dirops);
spin_lock_init(&ci->i_unsafe_lock);
ci->i_snap_realm = NULL;
INIT_LIST_HEAD(&ci->i_snap_realm_item);
INIT_LIST_HEAD(&ci->i_snap_flush_item);
INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
return &ci->vfs_inode;
}
static void ceph_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
struct ceph_inode_info *ci = ceph_inode(inode);
INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(ceph_inode_cachep, ci);
}
void ceph_destroy_inode(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_inode_frag *frag;
struct rb_node *n;
dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
ceph_queue_caps_release(inode);
/*
* we may still have a snap_realm reference if there are stray
* caps in i_cap_exporting_issued or i_snap_caps.
*/
if (ci->i_snap_realm) {
struct ceph_mds_client *mdsc =
ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
struct ceph_snap_realm *realm = ci->i_snap_realm;
dout(" dropping residual ref to snap realm %p\n", realm);
spin_lock(&realm->inodes_with_caps_lock);
list_del_init(&ci->i_snap_realm_item);
spin_unlock(&realm->inodes_with_caps_lock);
ceph_put_snap_realm(mdsc, realm);
}
kfree(ci->i_symlink);
while ((n = rb_first(&ci->i_fragtree)) != NULL) {
frag = rb_entry(n, struct ceph_inode_frag, node);
rb_erase(n, &ci->i_fragtree);
kfree(frag);
}
__ceph_destroy_xattrs(ci);
if (ci->i_xattrs.blob)
ceph_buffer_put(ci->i_xattrs.blob);
if (ci->i_xattrs.prealloc_blob)
ceph_buffer_put(ci->i_xattrs.prealloc_blob);
call_rcu(&inode->i_rcu, ceph_i_callback);
}
/*
* Helpers to fill in size, ctime, mtime, and atime. We have to be
* careful because either the client or MDS may have more up to date
* info, depending on which capabilities are held, and whether
* time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
* and size are monotonically increasing, except when utimes() or
* truncate() increments the corresponding _seq values.)
*/
int ceph_fill_file_size(struct inode *inode, int issued,
u32 truncate_seq, u64 truncate_size, u64 size)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int queue_trunc = 0;
if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
(truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
dout("size %lld -> %llu\n", inode->i_size, size);
inode->i_size = size;
inode->i_blocks = (size + (1<<9) - 1) >> 9;
ci->i_reported_size = size;
if (truncate_seq != ci->i_truncate_seq) {
dout("truncate_seq %u -> %u\n",
ci->i_truncate_seq, truncate_seq);
ci->i_truncate_seq = truncate_seq;
/*
* If we hold relevant caps, or in the case where we're
* not the only client referencing this file and we
* don't hold those caps, then we need to check whether
* the file is either opened or mmaped
*/
if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
CEPH_CAP_FILE_EXCL|
CEPH_CAP_FILE_LAZYIO)) ||
mapping_mapped(inode->i_mapping) ||
__ceph_caps_file_wanted(ci)) {
ci->i_truncate_pending++;
queue_trunc = 1;
}
}
}
if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
ci->i_truncate_size != truncate_size) {
dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
truncate_size);
ci->i_truncate_size = truncate_size;
}
return queue_trunc;
}
void ceph_fill_file_time(struct inode *inode, int issued,
u64 time_warp_seq, struct timespec *ctime,
struct timespec *mtime, struct timespec *atime)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int warn = 0;
if (issued & (CEPH_CAP_FILE_EXCL|
CEPH_CAP_FILE_WR|
CEPH_CAP_FILE_BUFFER|
CEPH_CAP_AUTH_EXCL|
CEPH_CAP_XATTR_EXCL)) {
if (timespec_compare(ctime, &inode->i_ctime) > 0) {
dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
ctime->tv_sec, ctime->tv_nsec);
inode->i_ctime = *ctime;
}
if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
/* the MDS did a utimes() */
dout("mtime %ld.%09ld -> %ld.%09ld "
"tw %d -> %d\n",
inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
mtime->tv_sec, mtime->tv_nsec,
ci->i_time_warp_seq, (int)time_warp_seq);
inode->i_mtime = *mtime;
inode->i_atime = *atime;
ci->i_time_warp_seq = time_warp_seq;
} else if (time_warp_seq == ci->i_time_warp_seq) {
/* nobody did utimes(); take the max */
if (timespec_compare(mtime, &inode->i_mtime) > 0) {
dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
inode->i_mtime.tv_sec,
inode->i_mtime.tv_nsec,
mtime->tv_sec, mtime->tv_nsec);
inode->i_mtime = *mtime;
}
if (timespec_compare(atime, &inode->i_atime) > 0) {
dout("atime %ld.%09ld -> %ld.%09ld inc\n",
inode->i_atime.tv_sec,
inode->i_atime.tv_nsec,
atime->tv_sec, atime->tv_nsec);
inode->i_atime = *atime;
}
} else if (issued & CEPH_CAP_FILE_EXCL) {
/* we did a utimes(); ignore mds values */
} else {
warn = 1;
}
} else {
/* we have no write|excl caps; whatever the MDS says is true */
if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
inode->i_ctime = *ctime;
inode->i_mtime = *mtime;
inode->i_atime = *atime;
ci->i_time_warp_seq = time_warp_seq;
} else {
warn = 1;
}
}
if (warn) /* time_warp_seq shouldn't go backwards */
dout("%p mds time_warp_seq %llu < %u\n",
inode, time_warp_seq, ci->i_time_warp_seq);
}
/*
* Populate an inode based on info from mds. May be called on new or
* existing inodes.
*/
static int fill_inode(struct inode *inode,
struct ceph_mds_reply_info_in *iinfo,
struct ceph_mds_reply_dirfrag *dirinfo,
struct ceph_mds_session *session,
unsigned long ttl_from, int cap_fmode,
struct ceph_cap_reservation *caps_reservation)
{
struct ceph_mds_reply_inode *info = iinfo->in;
struct ceph_inode_info *ci = ceph_inode(inode);
int i;
int issued, implemented;
struct timespec mtime, atime, ctime;
u32 nsplits;
struct ceph_buffer *xattr_blob = NULL;
int err = 0;
int queue_trunc = 0;
dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
inode, ceph_vinop(inode), le64_to_cpu(info->version),
ci->i_version);
/*
* prealloc xattr data, if it looks like we'll need it. only
* if len > 4 (meaning there are actually xattrs; the first 4
* bytes are the xattr count).
*/
if (iinfo->xattr_len > 4) {
xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
if (!xattr_blob)
pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
iinfo->xattr_len);
}
spin_lock(&inode->i_lock);
/*
* provided version will be odd if inode value is projected,
* even if stable. skip the update if we have newer stable
* info (ours>=theirs, e.g. due to racing mds replies), unless
* we are getting projected (unstable) info (in which case the
* version is odd, and we want ours>theirs).
* us them
* 2 2 skip
* 3 2 skip
* 3 3 update
*/
if (le64_to_cpu(info->version) > 0 &&
(ci->i_version & ~1) >= le64_to_cpu(info->version))
goto no_change;
issued = __ceph_caps_issued(ci, &implemented);
issued |= implemented | __ceph_caps_dirty(ci);
/* update inode */
ci->i_version = le64_to_cpu(info->version);
inode->i_version++;
inode->i_rdev = le32_to_cpu(info->rdev);
if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
inode->i_mode = le32_to_cpu(info->mode);
inode->i_uid = le32_to_cpu(info->uid);
inode->i_gid = le32_to_cpu(info->gid);
dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
inode->i_uid, inode->i_gid);
}
if ((issued & CEPH_CAP_LINK_EXCL) == 0)
inode->i_nlink = le32_to_cpu(info->nlink);
/* be careful with mtime, atime, size */
ceph_decode_timespec(&atime, &info->atime);
ceph_decode_timespec(&mtime, &info->mtime);
ceph_decode_timespec(&ctime, &info->ctime);
queue_trunc = ceph_fill_file_size(inode, issued,
le32_to_cpu(info->truncate_seq),
le64_to_cpu(info->truncate_size),
le64_to_cpu(info->size));
ceph_fill_file_time(inode, issued,
le32_to_cpu(info->time_warp_seq),
&ctime, &mtime, &atime);
/* only update max_size on auth cap */
if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
ci->i_max_size != le64_to_cpu(info->max_size)) {
dout("max_size %lld -> %llu\n", ci->i_max_size,
le64_to_cpu(info->max_size));
ci->i_max_size = le64_to_cpu(info->max_size);
}
ci->i_layout = info->layout;
inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
/* xattrs */
/* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
if (ci->i_xattrs.blob)
ceph_buffer_put(ci->i_xattrs.blob);
ci->i_xattrs.blob = xattr_blob;
if (xattr_blob)
memcpy(ci->i_xattrs.blob->vec.iov_base,
iinfo->xattr_data, iinfo->xattr_len);
ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
xattr_blob = NULL;
}
inode->i_mapping->a_ops = &ceph_aops;
inode->i_mapping->backing_dev_info =
&ceph_sb_to_client(inode->i_sb)->backing_dev_info;
switch (inode->i_mode & S_IFMT) {
case S_IFIFO:
case S_IFBLK:
case S_IFCHR:
case S_IFSOCK:
init_special_inode(inode, inode->i_mode, inode->i_rdev);
inode->i_op = &ceph_file_iops;
break;
case S_IFREG:
inode->i_op = &ceph_file_iops;
inode->i_fop = &ceph_file_fops;
break;
case S_IFLNK:
inode->i_op = &ceph_symlink_iops;
if (!ci->i_symlink) {
int symlen = iinfo->symlink_len;
char *sym;
BUG_ON(symlen != inode->i_size);
spin_unlock(&inode->i_lock);
err = -ENOMEM;
sym = kmalloc(symlen+1, GFP_NOFS);
if (!sym)
goto out;
memcpy(sym, iinfo->symlink, symlen);
sym[symlen] = 0;
spin_lock(&inode->i_lock);
if (!ci->i_symlink)
ci->i_symlink = sym;
else
kfree(sym); /* lost a race */
}
break;
case S_IFDIR:
inode->i_op = &ceph_dir_iops;
inode->i_fop = &ceph_dir_fops;
ci->i_dir_layout = iinfo->dir_layout;
ci->i_files = le64_to_cpu(info->files);
ci->i_subdirs = le64_to_cpu(info->subdirs);
ci->i_rbytes = le64_to_cpu(info->rbytes);
ci->i_rfiles = le64_to_cpu(info->rfiles);
ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
ceph_decode_timespec(&ci->i_rctime, &info->rctime);
/* set dir completion flag? */
if (ci->i_files == 0 && ci->i_subdirs == 0 &&
ceph_snap(inode) == CEPH_NOSNAP &&
(le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
(issued & CEPH_CAP_FILE_EXCL) == 0 &&
(ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
dout(" marking %p complete (empty)\n", inode);
/* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
ci->i_max_offset = 2;
}
break;
default:
pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
ceph_vinop(inode), inode->i_mode);
}
no_change:
spin_unlock(&inode->i_lock);
/* queue truncate if we saw i_size decrease */
if (queue_trunc)
ceph_queue_vmtruncate(inode);
/* populate frag tree */
/* FIXME: move me up, if/when version reflects fragtree changes */
nsplits = le32_to_cpu(info->fragtree.nsplits);
mutex_lock(&ci->i_fragtree_mutex);
for (i = 0; i < nsplits; i++) {
u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
if (IS_ERR(frag))
continue;
frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
dout(" frag %x split by %d\n", frag->frag, frag->split_by);
}
mutex_unlock(&ci->i_fragtree_mutex);
/* were we issued a capability? */
if (info->cap.caps) {
if (ceph_snap(inode) == CEPH_NOSNAP) {
ceph_add_cap(inode, session,
le64_to_cpu(info->cap.cap_id),
cap_fmode,
le32_to_cpu(info->cap.caps),
le32_to_cpu(info->cap.wanted),
le32_to_cpu(info->cap.seq),
le32_to_cpu(info->cap.mseq),
le64_to_cpu(info->cap.realm),
info->cap.flags,
caps_reservation);
} else {
spin_lock(&inode->i_lock);
dout(" %p got snap_caps %s\n", inode,
ceph_cap_string(le32_to_cpu(info->cap.caps)));
ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
if (cap_fmode >= 0)
__ceph_get_fmode(ci, cap_fmode);
spin_unlock(&inode->i_lock);
}
} else if (cap_fmode >= 0) {
pr_warning("mds issued no caps on %llx.%llx\n",
ceph_vinop(inode));
__ceph_get_fmode(ci, cap_fmode);
}
/* update delegation info? */
if (dirinfo)
ceph_fill_dirfrag(inode, dirinfo);
err = 0;
out:
if (xattr_blob)
ceph_buffer_put(xattr_blob);
return err;
}
/*
* caller should hold session s_mutex.
*/
static void update_dentry_lease(struct dentry *dentry,
struct ceph_mds_reply_lease *lease,
struct ceph_mds_session *session,
unsigned long from_time)
{
struct ceph_dentry_info *di = ceph_dentry(dentry);
long unsigned duration = le32_to_cpu(lease->duration_ms);
long unsigned ttl = from_time + (duration * HZ) / 1000;
long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
struct inode *dir;
/* only track leases on regular dentries */
if (dentry->d_op != &ceph_dentry_ops)
return;
spin_lock(&dentry->d_lock);
dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
dentry, le16_to_cpu(lease->mask), duration, ttl);
/* make lease_rdcache_gen match directory */
dir = dentry->d_parent->d_inode;
di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
if (lease->mask == 0)
goto out_unlock;
if (di->lease_gen == session->s_cap_gen &&
time_before(ttl, dentry->d_time))
goto out_unlock; /* we already have a newer lease. */
if (di->lease_session && di->lease_session != session)
goto out_unlock;
ceph_dentry_lru_touch(dentry);
if (!di->lease_session)
di->lease_session = ceph_get_mds_session(session);
di->lease_gen = session->s_cap_gen;
di->lease_seq = le32_to_cpu(lease->seq);
di->lease_renew_after = half_ttl;
di->lease_renew_from = 0;
dentry->d_time = ttl;
out_unlock:
spin_unlock(&dentry->d_lock);
return;
}
/*
* Set dentry's directory position based on the current dir's max, and
* order it in d_subdirs, so that dcache_readdir behaves.
*/
static void ceph_set_dentry_offset(struct dentry *dn)
{
struct dentry *dir = dn->d_parent;
struct inode *inode = dn->d_parent->d_inode;
struct ceph_dentry_info *di;
BUG_ON(!inode);
di = ceph_dentry(dn);
spin_lock(&inode->i_lock);
if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
spin_unlock(&inode->i_lock);
return;
}
di->offset = ceph_inode(inode)->i_max_offset++;
spin_unlock(&inode->i_lock);
spin_lock(&dir->d_lock);
spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
list_move(&dn->d_u.d_child, &dir->d_subdirs);
dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
dn->d_u.d_child.prev, dn->d_u.d_child.next);
spin_unlock(&dn->d_lock);
spin_unlock(&dir->d_lock);
}
/*
* splice a dentry to an inode.
* caller must hold directory i_mutex for this to be safe.
*
* we will only rehash the resulting dentry if @prehash is
* true; @prehash will be set to false (for the benefit of
* the caller) if we fail.
*/
static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
bool *prehash, bool set_offset)
{
struct dentry *realdn;
BUG_ON(dn->d_inode);
/* dn must be unhashed */
if (!d_unhashed(dn))
d_drop(dn);
realdn = d_materialise_unique(dn, in);
if (IS_ERR(realdn)) {
pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
PTR_ERR(realdn), dn, in, ceph_vinop(in));
if (prehash)
*prehash = false; /* don't rehash on error */
dn = realdn; /* note realdn contains the error */
goto out;
} else if (realdn) {
dout("dn %p (%d) spliced with %p (%d) "
"inode %p ino %llx.%llx\n",
dn, dn->d_count,
realdn, realdn->d_count,
realdn->d_inode, ceph_vinop(realdn->d_inode));
dput(dn);
dn = realdn;
} else {
BUG_ON(!ceph_dentry(dn));
dout("dn %p attached to %p ino %llx.%llx\n",
dn, dn->d_inode, ceph_vinop(dn->d_inode));
}
if ((!prehash || *prehash) && d_unhashed(dn))
d_rehash(dn);
if (set_offset)
ceph_set_dentry_offset(dn);
out:
return dn;
}
/*
* Incorporate results into the local cache. This is either just
* one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
* after a lookup).
*
* A reply may contain
* a directory inode along with a dentry.
* and/or a target inode
*
* Called with snap_rwsem (read).
*/
int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
struct ceph_mds_session *session)
{
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
struct inode *in = NULL;
struct ceph_mds_reply_inode *ininfo;
struct ceph_vino vino;
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
int i = 0;
int err = 0;
dout("fill_trace %p is_dentry %d is_target %d\n", req,
rinfo->head->is_dentry, rinfo->head->is_target);
#if 0
/*
* Debugging hook:
*
* If we resend completed ops to a recovering mds, we get no
* trace. Since that is very rare, pretend this is the case
* to ensure the 'no trace' handlers in the callers behave.
*
* Fill in inodes unconditionally to avoid breaking cap
* invariants.
*/
if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
pr_info("fill_trace faking empty trace on %lld %s\n",
req->r_tid, ceph_mds_op_name(rinfo->head->op));
if (rinfo->head->is_dentry) {
rinfo->head->is_dentry = 0;
err = fill_inode(req->r_locked_dir,
&rinfo->diri, rinfo->dirfrag,
session, req->r_request_started, -1);
}
if (rinfo->head->is_target) {
rinfo->head->is_target = 0;
ininfo = rinfo->targeti.in;
vino.ino = le64_to_cpu(ininfo->ino);
vino.snap = le64_to_cpu(ininfo->snapid);
in = ceph_get_inode(sb, vino);
err = fill_inode(in, &rinfo->targeti, NULL,
session, req->r_request_started,
req->r_fmode);
iput(in);
}
}
#endif
if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
dout("fill_trace reply is empty!\n");
if (rinfo->head->result == 0 && req->r_locked_dir)
ceph_invalidate_dir_request(req);
return 0;
}
if (rinfo->head->is_dentry) {
struct inode *dir = req->r_locked_dir;
err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
session, req->r_request_started, -1,
&req->r_caps_reservation);
if (err < 0)
return err;
}
/*
* ignore null lease/binding on snapdir ENOENT, or else we
* will have trouble splicing in the virtual snapdir later
*/
if (rinfo->head->is_dentry && !req->r_aborted &&
(rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
fsc->mount_options->snapdir_name,
req->r_dentry->d_name.len))) {
/*
* lookup link rename : null -> possibly existing inode
* mknod symlink mkdir : null -> new inode
* unlink : linked -> null
*/
struct inode *dir = req->r_locked_dir;
struct dentry *dn = req->r_dentry;
bool have_dir_cap, have_lease;
BUG_ON(!dn);
BUG_ON(!dir);
BUG_ON(dn->d_parent->d_inode != dir);
BUG_ON(ceph_ino(dir) !=
le64_to_cpu(rinfo->diri.in->ino));
BUG_ON(ceph_snap(dir) !=
le64_to_cpu(rinfo->diri.in->snapid));
/* do we have a lease on the whole dir? */
have_dir_cap =
(le32_to_cpu(rinfo->diri.in->cap.caps) &
CEPH_CAP_FILE_SHARED);
/* do we have a dn lease? */
have_lease = have_dir_cap ||
(le16_to_cpu(rinfo->dlease->mask) &
CEPH_LOCK_DN);
if (!have_lease)
dout("fill_trace no dentry lease or dir cap\n");
/* rename? */
if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
dout(" src %p '%.*s' dst %p '%.*s'\n",
req->r_old_dentry,
req->r_old_dentry->d_name.len,
req->r_old_dentry->d_name.name,
dn, dn->d_name.len, dn->d_name.name);
dout("fill_trace doing d_move %p -> %p\n",
req->r_old_dentry, dn);
d_move(req->r_old_dentry, dn);
dout(" src %p '%.*s' dst %p '%.*s'\n",
req->r_old_dentry,
req->r_old_dentry->d_name.len,
req->r_old_dentry->d_name.name,
dn, dn->d_name.len, dn->d_name.name);
/* ensure target dentry is invalidated, despite
rehashing bug in vfs_rename_dir */
ceph_invalidate_dentry_lease(dn);
/*
* d_move() puts the renamed dentry at the end of
* d_subdirs. We need to assign it an appropriate
* directory offset so we can behave when holding
* I_COMPLETE.
*/
ceph_set_dentry_offset(req->r_old_dentry);
dout("dn %p gets new offset %lld\n", req->r_old_dentry,
ceph_dentry(req->r_old_dentry)->offset);
dn = req->r_old_dentry; /* use old_dentry */
in = dn->d_inode;
}
/* null dentry? */
if (!rinfo->head->is_target) {
dout("fill_trace null dentry\n");
if (dn->d_inode) {
dout("d_delete %p\n", dn);
d_delete(dn);
} else {
dout("d_instantiate %p NULL\n", dn);
d_instantiate(dn, NULL);
if (have_lease && d_unhashed(dn))
d_rehash(dn);
update_dentry_lease(dn, rinfo->dlease,
session,
req->r_request_started);
}
goto done;
}
/* attach proper inode */
ininfo = rinfo->targeti.in;
vino.ino = le64_to_cpu(ininfo->ino);
vino.snap = le64_to_cpu(ininfo->snapid);
in = dn->d_inode;
if (!in) {
in = ceph_get_inode(sb, vino);
if (IS_ERR(in)) {
pr_err("fill_trace bad get_inode "
"%llx.%llx\n", vino.ino, vino.snap);
err = PTR_ERR(in);
d_delete(dn);
goto done;
}
dn = splice_dentry(dn, in, &have_lease, true);
if (IS_ERR(dn)) {
err = PTR_ERR(dn);
goto done;
}
req->r_dentry = dn; /* may have spliced */
igrab(in);
} else if (ceph_ino(in) == vino.ino &&
ceph_snap(in) == vino.snap) {
igrab(in);
} else {
dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
dn, in, ceph_ino(in), ceph_snap(in),
vino.ino, vino.snap);
have_lease = false;
in = NULL;
}
if (have_lease)
update_dentry_lease(dn, rinfo->dlease, session,
req->r_request_started);
dout(" final dn %p\n", dn);
i++;
} else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
req->r_op == CEPH_MDS_OP_MKSNAP) {
struct dentry *dn = req->r_dentry;
/* fill out a snapdir LOOKUPSNAP dentry */
BUG_ON(!dn);
BUG_ON(!req->r_locked_dir);
BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
ininfo = rinfo->targeti.in;
vino.ino = le64_to_cpu(ininfo->ino);
vino.snap = le64_to_cpu(ininfo->snapid);
in = ceph_get_inode(sb, vino);
if (IS_ERR(in)) {
pr_err("fill_inode get_inode badness %llx.%llx\n",
vino.ino, vino.snap);
err = PTR_ERR(in);
d_delete(dn);
goto done;
}
dout(" linking snapped dir %p to dn %p\n", in, dn);
dn = splice_dentry(dn, in, NULL, true);
if (IS_ERR(dn)) {
err = PTR_ERR(dn);
goto done;
}
req->r_dentry = dn; /* may have spliced */
igrab(in);
rinfo->head->is_dentry = 1; /* fool notrace handlers */
}
if (rinfo->head->is_target) {
vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
if (in == NULL || ceph_ino(in) != vino.ino ||
ceph_snap(in) != vino.snap) {
in = ceph_get_inode(sb, vino);
if (IS_ERR(in)) {
err = PTR_ERR(in);
goto done;
}
}
req->r_target_inode = in;
err = fill_inode(in,
&rinfo->targeti, NULL,
session, req->r_request_started,
(le32_to_cpu(rinfo->head->result) == 0) ?
req->r_fmode : -1,
&req->r_caps_reservation);
if (err < 0) {
pr_err("fill_inode badness %p %llx.%llx\n",
in, ceph_vinop(in));
goto done;
}
}
done:
dout("fill_trace done err=%d\n", err);
return err;
}
/*
* Prepopulate our cache with readdir results, leases, etc.
*/
int ceph_readdir_prepopulate(struct ceph_mds_request *req,
struct ceph_mds_session *session)
{
struct dentry *parent = req->r_dentry;
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
struct qstr dname;
struct dentry *dn;
struct inode *in;
int err = 0, i;
struct inode *snapdir = NULL;
struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
u64 frag = le32_to_cpu(rhead->args.readdir.frag);
struct ceph_dentry_info *di;
if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
snapdir = ceph_get_snapdir(parent->d_inode);
parent = d_find_alias(snapdir);
dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
rinfo->dir_nr, parent);
} else {
dout("readdir_prepopulate %d items under dn %p\n",
rinfo->dir_nr, parent);
if (rinfo->dir_dir)
ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
}
for (i = 0; i < rinfo->dir_nr; i++) {
struct ceph_vino vino;
dname.name = rinfo->dir_dname[i];
dname.len = rinfo->dir_dname_len[i];
dname.hash = full_name_hash(dname.name, dname.len);
vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
retry_lookup:
dn = d_lookup(parent, &dname);
dout("d_lookup on parent=%p name=%.*s got %p\n",
parent, dname.len, dname.name, dn);
if (!dn) {
dn = d_alloc(parent, &dname);
dout("d_alloc %p '%.*s' = %p\n", parent,
dname.len, dname.name, dn);
if (dn == NULL) {
dout("d_alloc badness\n");
err = -ENOMEM;
goto out;
}
err = ceph_init_dentry(dn);
if (err < 0) {
dput(dn);
goto out;
}
} else if (dn->d_inode &&
(ceph_ino(dn->d_inode) != vino.ino ||
ceph_snap(dn->d_inode) != vino.snap)) {
dout(" dn %p points to wrong inode %p\n",
dn, dn->d_inode);
d_delete(dn);
dput(dn);
goto retry_lookup;
} else {
/* reorder parent's d_subdirs */
spin_lock(&parent->d_lock);
spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
list_move(&dn->d_u.d_child, &parent->d_subdirs);
spin_unlock(&dn->d_lock);
spin_unlock(&parent->d_lock);
}
di = dn->d_fsdata;
di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
/* inode */
if (dn->d_inode) {
in = dn->d_inode;
} else {
in = ceph_get_inode(parent->d_sb, vino);
if (IS_ERR(in)) {
dout("new_inode badness\n");
d_delete(dn);
dput(dn);
err = PTR_ERR(in);
goto out;
}
dn = splice_dentry(dn, in, NULL, false);
if (IS_ERR(dn))
dn = NULL;
}
if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
req->r_request_started, -1,
&req->r_caps_reservation) < 0) {
pr_err("fill_inode badness on %p\n", in);
goto next_item;
}
if (dn)
update_dentry_lease(dn, rinfo->dir_dlease[i],
req->r_session,
req->r_request_started);
next_item:
if (dn)
dput(dn);
}
req->r_did_prepopulate = true;
out:
if (snapdir) {
iput(snapdir);
dput(parent);
}
dout("readdir_prepopulate done\n");
return err;
}
int ceph_inode_set_size(struct inode *inode, loff_t size)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int ret = 0;
spin_lock(&inode->i_lock);
dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
inode->i_size = size;
inode->i_blocks = (size + (1 << 9) - 1) >> 9;
/* tell the MDS if we are approaching max_size */
if ((size << 1) >= ci->i_max_size &&
(ci->i_reported_size << 1) < ci->i_max_size)
ret = 1;
spin_unlock(&inode->i_lock);
return ret;
}
/*
* Write back inode data in a worker thread. (This can't be done
* in the message handler context.)
*/
void ceph_queue_writeback(struct inode *inode)
{
if (queue_work(ceph_inode_to_client(inode)->wb_wq,
&ceph_inode(inode)->i_wb_work)) {
dout("ceph_queue_writeback %p\n", inode);
igrab(inode);
} else {
dout("ceph_queue_writeback %p failed\n", inode);
}
}
static void ceph_writeback_work(struct work_struct *work)
{
struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
i_wb_work);
struct inode *inode = &ci->vfs_inode;
dout("writeback %p\n", inode);
filemap_fdatawrite(&inode->i_data);
iput(inode);
}
/*
* queue an async invalidation
*/
void ceph_queue_invalidate(struct inode *inode)
{
if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
&ceph_inode(inode)->i_pg_inv_work)) {
dout("ceph_queue_invalidate %p\n", inode);
igrab(inode);
} else {
dout("ceph_queue_invalidate %p failed\n", inode);
}
}
/*
* invalidate any pages that are not dirty or under writeback. this
* includes pages that are clean and mapped.
*/
static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
{
struct pagevec pvec;
pgoff_t next = 0;
int i;
pagevec_init(&pvec, 0);
while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
pgoff_t index;
int skip_page =
(PageDirty(page) || PageWriteback(page));
if (!skip_page)
skip_page = !trylock_page(page);
/*
* We really shouldn't be looking at the ->index of an
* unlocked page. But we're not allowed to lock these
* pages. So we rely upon nobody altering the ->index
* of this (pinned-by-us) page.
*/
index = page->index;
if (index > next)
next = index;
next++;
if (skip_page)
continue;
generic_error_remove_page(mapping, page);
unlock_page(page);
}
pagevec_release(&pvec);
cond_resched();
}
}
/*
* Invalidate inode pages in a worker thread. (This can't be done
* in the message handler context.)
*/
static void ceph_invalidate_work(struct work_struct *work)
{
struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
i_pg_inv_work);
struct inode *inode = &ci->vfs_inode;
u32 orig_gen;
int check = 0;
spin_lock(&inode->i_lock);
dout("invalidate_pages %p gen %d revoking %d\n", inode,
ci->i_rdcache_gen, ci->i_rdcache_revoking);
if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
/* nevermind! */
spin_unlock(&inode->i_lock);
goto out;
}
orig_gen = ci->i_rdcache_gen;
spin_unlock(&inode->i_lock);
ceph_invalidate_nondirty_pages(inode->i_mapping);
spin_lock(&inode->i_lock);
if (orig_gen == ci->i_rdcache_gen &&
orig_gen == ci->i_rdcache_revoking) {
dout("invalidate_pages %p gen %d successful\n", inode,
ci->i_rdcache_gen);
ci->i_rdcache_revoking--;
check = 1;
} else {
dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
inode, orig_gen, ci->i_rdcache_gen,
ci->i_rdcache_revoking);
}
spin_unlock(&inode->i_lock);
if (check)
ceph_check_caps(ci, 0, NULL);
out:
iput(inode);
}
/*
* called by trunc_wq; take i_mutex ourselves
*
* We also truncate in a separate thread as well.
*/
static void ceph_vmtruncate_work(struct work_struct *work)
{
struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
i_vmtruncate_work);
struct inode *inode = &ci->vfs_inode;
dout("vmtruncate_work %p\n", inode);
mutex_lock(&inode->i_mutex);
__ceph_do_pending_vmtruncate(inode);
mutex_unlock(&inode->i_mutex);
iput(inode);
}
/*
* Queue an async vmtruncate. If we fail to queue work, we will handle
* the truncation the next time we call __ceph_do_pending_vmtruncate.
*/
void ceph_queue_vmtruncate(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
&ci->i_vmtruncate_work)) {
dout("ceph_queue_vmtruncate %p\n", inode);
igrab(inode);
} else {
dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
inode, ci->i_truncate_pending);
}
}
/*
* called with i_mutex held.
*
* Make sure any pending truncation is applied before doing anything
* that may depend on it.
*/
void __ceph_do_pending_vmtruncate(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
u64 to;
int wrbuffer_refs, wake = 0;
retry:
spin_lock(&inode->i_lock);
if (ci->i_truncate_pending == 0) {
dout("__do_pending_vmtruncate %p none pending\n", inode);
spin_unlock(&inode->i_lock);
return;
}
/*
* make sure any dirty snapped pages are flushed before we
* possibly truncate them.. so write AND block!
*/
if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
dout("__do_pending_vmtruncate %p flushing snaps first\n",
inode);
spin_unlock(&inode->i_lock);
filemap_write_and_wait_range(&inode->i_data, 0,
inode->i_sb->s_maxbytes);
goto retry;
}
to = ci->i_truncate_size;
wrbuffer_refs = ci->i_wrbuffer_ref;
dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
ci->i_truncate_pending, to);
spin_unlock(&inode->i_lock);
truncate_inode_pages(inode->i_mapping, to);
spin_lock(&inode->i_lock);
ci->i_truncate_pending--;
if (ci->i_truncate_pending == 0)
wake = 1;
spin_unlock(&inode->i_lock);
if (wrbuffer_refs == 0)
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
if (wake)
wake_up_all(&ci->i_cap_wq);
}
/*
* symlinks
*/
static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
nd_set_link(nd, ci->i_symlink);
return NULL;
}
static const struct inode_operations ceph_symlink_iops = {
.readlink = generic_readlink,
.follow_link = ceph_sym_follow_link,
};
/*
* setattr
*/
int ceph_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
struct ceph_inode_info *ci = ceph_inode(inode);
struct inode *parent_inode = dentry->d_parent->d_inode;
const unsigned int ia_valid = attr->ia_valid;
struct ceph_mds_request *req;
struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
int issued;
int release = 0, dirtied = 0;
int mask = 0;
int err = 0;
int inode_dirty_flags = 0;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
__ceph_do_pending_vmtruncate(inode);
err = inode_change_ok(inode, attr);
if (err != 0)
return err;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
USE_AUTH_MDS);
if (IS_ERR(req))
return PTR_ERR(req);
spin_lock(&inode->i_lock);
issued = __ceph_caps_issued(ci, NULL);
dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
if (ia_valid & ATTR_UID) {
dout("setattr %p uid %d -> %d\n", inode,
inode->i_uid, attr->ia_uid);
if (issued & CEPH_CAP_AUTH_EXCL) {
inode->i_uid = attr->ia_uid;
dirtied |= CEPH_CAP_AUTH_EXCL;
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
attr->ia_uid != inode->i_uid) {
req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
mask |= CEPH_SETATTR_UID;
release |= CEPH_CAP_AUTH_SHARED;
}
}
if (ia_valid & ATTR_GID) {
dout("setattr %p gid %d -> %d\n", inode,
inode->i_gid, attr->ia_gid);
if (issued & CEPH_CAP_AUTH_EXCL) {
inode->i_gid = attr->ia_gid;
dirtied |= CEPH_CAP_AUTH_EXCL;
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
attr->ia_gid != inode->i_gid) {
req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
mask |= CEPH_SETATTR_GID;
release |= CEPH_CAP_AUTH_SHARED;
}
}
if (ia_valid & ATTR_MODE) {
dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
attr->ia_mode);
if (issued & CEPH_CAP_AUTH_EXCL) {
inode->i_mode = attr->ia_mode;
dirtied |= CEPH_CAP_AUTH_EXCL;
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
attr->ia_mode != inode->i_mode) {
req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
mask |= CEPH_SETATTR_MODE;
release |= CEPH_CAP_AUTH_SHARED;
}
}
if (ia_valid & ATTR_ATIME) {
dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
if (issued & CEPH_CAP_FILE_EXCL) {
ci->i_time_warp_seq++;
inode->i_atime = attr->ia_atime;
dirtied |= CEPH_CAP_FILE_EXCL;
} else if ((issued & CEPH_CAP_FILE_WR) &&
timespec_compare(&inode->i_atime,
&attr->ia_atime) < 0) {
inode->i_atime = attr->ia_atime;
dirtied |= CEPH_CAP_FILE_WR;
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
!timespec_equal(&inode->i_atime, &attr->ia_atime)) {
ceph_encode_timespec(&req->r_args.setattr.atime,
&attr->ia_atime);
mask |= CEPH_SETATTR_ATIME;
release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
CEPH_CAP_FILE_WR;
}
}
if (ia_valid & ATTR_MTIME) {
dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
if (issued & CEPH_CAP_FILE_EXCL) {
ci->i_time_warp_seq++;
inode->i_mtime = attr->ia_mtime;
dirtied |= CEPH_CAP_FILE_EXCL;
} else if ((issued & CEPH_CAP_FILE_WR) &&
timespec_compare(&inode->i_mtime,
&attr->ia_mtime) < 0) {
inode->i_mtime = attr->ia_mtime;
dirtied |= CEPH_CAP_FILE_WR;
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
!timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
ceph_encode_timespec(&req->r_args.setattr.mtime,
&attr->ia_mtime);
mask |= CEPH_SETATTR_MTIME;
release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
CEPH_CAP_FILE_WR;
}
}
if (ia_valid & ATTR_SIZE) {
dout("setattr %p size %lld -> %lld\n", inode,
inode->i_size, attr->ia_size);
if (attr->ia_size > inode->i_sb->s_maxbytes) {
err = -EINVAL;
goto out;
}
if ((issued & CEPH_CAP_FILE_EXCL) &&
attr->ia_size > inode->i_size) {
inode->i_size = attr->ia_size;
inode->i_blocks =
(attr->ia_size + (1 << 9) - 1) >> 9;
inode->i_ctime = attr->ia_ctime;
ci->i_reported_size = attr->ia_size;
dirtied |= CEPH_CAP_FILE_EXCL;
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
attr->ia_size != inode->i_size) {
req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
req->r_args.setattr.old_size =
cpu_to_le64(inode->i_size);
mask |= CEPH_SETATTR_SIZE;
release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
CEPH_CAP_FILE_WR;
}
}
/* these do nothing */
if (ia_valid & ATTR_CTIME) {
bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
only ? "ctime only" : "ignored");
inode->i_ctime = attr->ia_ctime;
if (only) {
/*
* if kernel wants to dirty ctime but nothing else,
* we need to choose a cap to dirty under, or do
* a almost-no-op setattr
*/
if (issued & CEPH_CAP_AUTH_EXCL)
dirtied |= CEPH_CAP_AUTH_EXCL;
else if (issued & CEPH_CAP_FILE_EXCL)
dirtied |= CEPH_CAP_FILE_EXCL;
else if (issued & CEPH_CAP_XATTR_EXCL)
dirtied |= CEPH_CAP_XATTR_EXCL;
else
mask |= CEPH_SETATTR_CTIME;
}
}
if (ia_valid & ATTR_FILE)
dout("setattr %p ATTR_FILE ... hrm!\n", inode);
if (dirtied) {
inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
inode->i_ctime = CURRENT_TIME;
}
release &= issued;
spin_unlock(&inode->i_lock);
if (inode_dirty_flags)
__mark_inode_dirty(inode, inode_dirty_flags);
if (mask) {
req->r_inode = igrab(inode);
req->r_inode_drop = release;
req->r_args.setattr.mask = cpu_to_le32(mask);
req->r_num_caps = 1;
err = ceph_mdsc_do_request(mdsc, parent_inode, req);
}
dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
ceph_cap_string(dirtied), mask);
ceph_mdsc_put_request(req);
__ceph_do_pending_vmtruncate(inode);
return err;
out:
spin_unlock(&inode->i_lock);
ceph_mdsc_put_request(req);
return err;
}
/*
* Verify that we have a lease on the given mask. If not,
* do a getattr against an mds.
*/
int ceph_do_getattr(struct inode *inode, int mask)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_mds_request *req;
int err;
if (ceph_snap(inode) == CEPH_SNAPDIR) {
dout("do_getattr inode %p SNAPDIR\n", inode);
return 0;
}
dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
return 0;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
if (IS_ERR(req))
return PTR_ERR(req);
req->r_inode = igrab(inode);
req->r_num_caps = 1;
req->r_args.getattr.mask = cpu_to_le32(mask);
err = ceph_mdsc_do_request(mdsc, NULL, req);
ceph_mdsc_put_request(req);
dout("do_getattr result=%d\n", err);
return err;
}
/*
* Check inode permissions. We verify we have a valid value for
* the AUTH cap, then call the generic handler.
*/
int ceph_permission(struct inode *inode, int mask, unsigned int flags)
{
int err;
if (flags & IPERM_FLAG_RCU)
return -ECHILD;
err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
if (!err)
err = generic_permission(inode, mask, flags, NULL);
return err;
}
/*
* Get all attributes. Hopefully somedata we'll have a statlite()
* and can limit the fields we require to be accurate.
*/
int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
{
struct inode *inode = dentry->d_inode;
struct ceph_inode_info *ci = ceph_inode(inode);
int err;
err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
if (!err) {
generic_fillattr(inode, stat);
stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
if (ceph_snap(inode) != CEPH_NOSNAP)
stat->dev = ceph_snap(inode);
else
stat->dev = 0;
if (S_ISDIR(inode->i_mode)) {
if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
RBYTES))
stat->size = ci->i_rbytes;
else
stat->size = ci->i_files + ci->i_subdirs;
stat->blocks = 0;
stat->blksize = 65536;
}
}
return err;
}