70b666c3b4
We should use ihold whenever we already have a stable inode ref, even when we aren't holding i_lock. This avoids adding new and unnecessary locking dependencies. Signed-off-by: Sage Weil <sage@newdream.net>
1275 lines
34 KiB
C
1275 lines
34 KiB
C
#include <linux/ceph/ceph_debug.h>
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/fs_struct.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sched.h>
|
|
|
|
#include "super.h"
|
|
#include "mds_client.h"
|
|
|
|
/*
|
|
* Directory operations: readdir, lookup, create, link, unlink,
|
|
* rename, etc.
|
|
*/
|
|
|
|
/*
|
|
* Ceph MDS operations are specified in terms of a base ino and
|
|
* relative path. Thus, the client can specify an operation on a
|
|
* specific inode (e.g., a getattr due to fstat(2)), or as a path
|
|
* relative to, say, the root directory.
|
|
*
|
|
* Normally, we limit ourselves to strict inode ops (no path component)
|
|
* or dentry operations (a single path component relative to an ino). The
|
|
* exception to this is open_root_dentry(), which will open the mount
|
|
* point by name.
|
|
*/
|
|
|
|
const struct inode_operations ceph_dir_iops;
|
|
const struct file_operations ceph_dir_fops;
|
|
const struct dentry_operations ceph_dentry_ops;
|
|
|
|
/*
|
|
* Initialize ceph dentry state.
|
|
*/
|
|
int ceph_init_dentry(struct dentry *dentry)
|
|
{
|
|
struct ceph_dentry_info *di;
|
|
|
|
if (dentry->d_fsdata)
|
|
return 0;
|
|
|
|
if (dentry->d_parent == NULL || /* nfs fh_to_dentry */
|
|
ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
|
|
d_set_d_op(dentry, &ceph_dentry_ops);
|
|
else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
|
|
d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
|
|
else
|
|
d_set_d_op(dentry, &ceph_snap_dentry_ops);
|
|
|
|
di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
|
|
if (!di)
|
|
return -ENOMEM; /* oh well */
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
if (dentry->d_fsdata) {
|
|
/* lost a race */
|
|
kmem_cache_free(ceph_dentry_cachep, di);
|
|
goto out_unlock;
|
|
}
|
|
di->dentry = dentry;
|
|
di->lease_session = NULL;
|
|
dentry->d_fsdata = di;
|
|
dentry->d_time = jiffies;
|
|
ceph_dentry_lru_add(dentry);
|
|
out_unlock:
|
|
spin_unlock(&dentry->d_lock);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* for readdir, we encode the directory frag and offset within that
|
|
* frag into f_pos.
|
|
*/
|
|
static unsigned fpos_frag(loff_t p)
|
|
{
|
|
return p >> 32;
|
|
}
|
|
static unsigned fpos_off(loff_t p)
|
|
{
|
|
return p & 0xffffffff;
|
|
}
|
|
|
|
/*
|
|
* When possible, we try to satisfy a readdir by peeking at the
|
|
* dcache. We make this work by carefully ordering dentries on
|
|
* d_u.d_child when we initially get results back from the MDS, and
|
|
* falling back to a "normal" sync readdir if any dentries in the dir
|
|
* are dropped.
|
|
*
|
|
* I_COMPLETE tells indicates we have all dentries in the dir. It is
|
|
* defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
|
|
* the MDS if/when the directory is modified).
|
|
*/
|
|
static int __dcache_readdir(struct file *filp,
|
|
void *dirent, filldir_t filldir)
|
|
{
|
|
struct ceph_file_info *fi = filp->private_data;
|
|
struct dentry *parent = filp->f_dentry;
|
|
struct inode *dir = parent->d_inode;
|
|
struct list_head *p;
|
|
struct dentry *dentry, *last;
|
|
struct ceph_dentry_info *di;
|
|
int err = 0;
|
|
|
|
/* claim ref on last dentry we returned */
|
|
last = fi->dentry;
|
|
fi->dentry = NULL;
|
|
|
|
dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos,
|
|
last);
|
|
|
|
spin_lock(&parent->d_lock);
|
|
|
|
/* start at beginning? */
|
|
if (filp->f_pos == 2 || last == NULL ||
|
|
filp->f_pos < ceph_dentry(last)->offset) {
|
|
if (list_empty(&parent->d_subdirs))
|
|
goto out_unlock;
|
|
p = parent->d_subdirs.prev;
|
|
dout(" initial p %p/%p\n", p->prev, p->next);
|
|
} else {
|
|
p = last->d_u.d_child.prev;
|
|
}
|
|
|
|
more:
|
|
dentry = list_entry(p, struct dentry, d_u.d_child);
|
|
di = ceph_dentry(dentry);
|
|
while (1) {
|
|
dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
|
|
d_unhashed(dentry) ? "!hashed" : "hashed",
|
|
parent->d_subdirs.prev, parent->d_subdirs.next);
|
|
if (p == &parent->d_subdirs) {
|
|
fi->at_end = 1;
|
|
goto out_unlock;
|
|
}
|
|
spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
|
|
if (!d_unhashed(dentry) && dentry->d_inode &&
|
|
ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
|
|
ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
|
|
filp->f_pos <= di->offset)
|
|
break;
|
|
dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
|
|
dentry->d_name.len, dentry->d_name.name, di->offset,
|
|
filp->f_pos, d_unhashed(dentry) ? " unhashed" : "",
|
|
!dentry->d_inode ? " null" : "");
|
|
spin_unlock(&dentry->d_lock);
|
|
p = p->prev;
|
|
dentry = list_entry(p, struct dentry, d_u.d_child);
|
|
di = ceph_dentry(dentry);
|
|
}
|
|
|
|
dget_dlock(dentry);
|
|
spin_unlock(&dentry->d_lock);
|
|
spin_unlock(&parent->d_lock);
|
|
|
|
dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos,
|
|
dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
|
|
filp->f_pos = di->offset;
|
|
err = filldir(dirent, dentry->d_name.name,
|
|
dentry->d_name.len, di->offset,
|
|
ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
|
|
dentry->d_inode->i_mode >> 12);
|
|
|
|
if (last) {
|
|
if (err < 0) {
|
|
/* remember our position */
|
|
fi->dentry = last;
|
|
fi->next_offset = di->offset;
|
|
} else {
|
|
dput(last);
|
|
}
|
|
}
|
|
last = dentry;
|
|
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
filp->f_pos++;
|
|
|
|
/* make sure a dentry wasn't dropped while we didn't have parent lock */
|
|
if (!ceph_i_test(dir, CEPH_I_COMPLETE)) {
|
|
dout(" lost I_COMPLETE on %p; falling back to mds\n", dir);
|
|
err = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&parent->d_lock);
|
|
p = p->prev; /* advance to next dentry */
|
|
goto more;
|
|
|
|
out_unlock:
|
|
spin_unlock(&parent->d_lock);
|
|
out:
|
|
if (last)
|
|
dput(last);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* make note of the last dentry we read, so we can
|
|
* continue at the same lexicographical point,
|
|
* regardless of what dir changes take place on the
|
|
* server.
|
|
*/
|
|
static int note_last_dentry(struct ceph_file_info *fi, const char *name,
|
|
int len)
|
|
{
|
|
kfree(fi->last_name);
|
|
fi->last_name = kmalloc(len+1, GFP_NOFS);
|
|
if (!fi->last_name)
|
|
return -ENOMEM;
|
|
memcpy(fi->last_name, name, len);
|
|
fi->last_name[len] = 0;
|
|
dout("note_last_dentry '%s'\n", fi->last_name);
|
|
return 0;
|
|
}
|
|
|
|
static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
|
{
|
|
struct ceph_file_info *fi = filp->private_data;
|
|
struct inode *inode = filp->f_dentry->d_inode;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
unsigned frag = fpos_frag(filp->f_pos);
|
|
int off = fpos_off(filp->f_pos);
|
|
int err;
|
|
u32 ftype;
|
|
struct ceph_mds_reply_info_parsed *rinfo;
|
|
const int max_entries = fsc->mount_options->max_readdir;
|
|
const int max_bytes = fsc->mount_options->max_readdir_bytes;
|
|
|
|
dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
|
|
if (fi->at_end)
|
|
return 0;
|
|
|
|
/* always start with . and .. */
|
|
if (filp->f_pos == 0) {
|
|
/* note dir version at start of readdir so we can tell
|
|
* if any dentries get dropped */
|
|
fi->dir_release_count = ci->i_release_count;
|
|
|
|
dout("readdir off 0 -> '.'\n");
|
|
if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0),
|
|
ceph_translate_ino(inode->i_sb, inode->i_ino),
|
|
inode->i_mode >> 12) < 0)
|
|
return 0;
|
|
filp->f_pos = 1;
|
|
off = 1;
|
|
}
|
|
if (filp->f_pos == 1) {
|
|
ino_t ino = filp->f_dentry->d_parent->d_inode->i_ino;
|
|
dout("readdir off 1 -> '..'\n");
|
|
if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1),
|
|
ceph_translate_ino(inode->i_sb, ino),
|
|
inode->i_mode >> 12) < 0)
|
|
return 0;
|
|
filp->f_pos = 2;
|
|
off = 2;
|
|
}
|
|
|
|
/* can we use the dcache? */
|
|
spin_lock(&inode->i_lock);
|
|
if ((filp->f_pos == 2 || fi->dentry) &&
|
|
!ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
|
|
ceph_snap(inode) != CEPH_SNAPDIR &&
|
|
(ci->i_ceph_flags & CEPH_I_COMPLETE) &&
|
|
__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
|
|
spin_unlock(&inode->i_lock);
|
|
err = __dcache_readdir(filp, dirent, filldir);
|
|
if (err != -EAGAIN)
|
|
return err;
|
|
} else {
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
if (fi->dentry) {
|
|
err = note_last_dentry(fi, fi->dentry->d_name.name,
|
|
fi->dentry->d_name.len);
|
|
if (err)
|
|
return err;
|
|
dput(fi->dentry);
|
|
fi->dentry = NULL;
|
|
}
|
|
|
|
/* proceed with a normal readdir */
|
|
|
|
more:
|
|
/* do we have the correct frag content buffered? */
|
|
if (fi->frag != frag || fi->last_readdir == NULL) {
|
|
struct ceph_mds_request *req;
|
|
int op = ceph_snap(inode) == CEPH_SNAPDIR ?
|
|
CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
|
|
|
|
/* discard old result, if any */
|
|
if (fi->last_readdir) {
|
|
ceph_mdsc_put_request(fi->last_readdir);
|
|
fi->last_readdir = NULL;
|
|
}
|
|
|
|
/* requery frag tree, as the frag topology may have changed */
|
|
frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);
|
|
|
|
dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
|
|
ceph_vinop(inode), frag, fi->last_name);
|
|
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
req->r_inode = inode;
|
|
ihold(inode);
|
|
req->r_dentry = dget(filp->f_dentry);
|
|
/* hints to request -> mds selection code */
|
|
req->r_direct_mode = USE_AUTH_MDS;
|
|
req->r_direct_hash = ceph_frag_value(frag);
|
|
req->r_direct_is_hash = true;
|
|
req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
|
|
req->r_readdir_offset = fi->next_offset;
|
|
req->r_args.readdir.frag = cpu_to_le32(frag);
|
|
req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
|
|
req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
|
|
req->r_num_caps = max_entries + 1;
|
|
err = ceph_mdsc_do_request(mdsc, NULL, req);
|
|
if (err < 0) {
|
|
ceph_mdsc_put_request(req);
|
|
return err;
|
|
}
|
|
dout("readdir got and parsed readdir result=%d"
|
|
" on frag %x, end=%d, complete=%d\n", err, frag,
|
|
(int)req->r_reply_info.dir_end,
|
|
(int)req->r_reply_info.dir_complete);
|
|
|
|
if (!req->r_did_prepopulate) {
|
|
dout("readdir !did_prepopulate");
|
|
fi->dir_release_count--; /* preclude I_COMPLETE */
|
|
}
|
|
|
|
/* note next offset and last dentry name */
|
|
fi->offset = fi->next_offset;
|
|
fi->last_readdir = req;
|
|
|
|
if (req->r_reply_info.dir_end) {
|
|
kfree(fi->last_name);
|
|
fi->last_name = NULL;
|
|
if (ceph_frag_is_rightmost(frag))
|
|
fi->next_offset = 2;
|
|
else
|
|
fi->next_offset = 0;
|
|
} else {
|
|
rinfo = &req->r_reply_info;
|
|
err = note_last_dentry(fi,
|
|
rinfo->dir_dname[rinfo->dir_nr-1],
|
|
rinfo->dir_dname_len[rinfo->dir_nr-1]);
|
|
if (err)
|
|
return err;
|
|
fi->next_offset += rinfo->dir_nr;
|
|
}
|
|
}
|
|
|
|
rinfo = &fi->last_readdir->r_reply_info;
|
|
dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
|
|
rinfo->dir_nr, off, fi->offset);
|
|
while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
|
|
u64 pos = ceph_make_fpos(frag, off);
|
|
struct ceph_mds_reply_inode *in =
|
|
rinfo->dir_in[off - fi->offset].in;
|
|
struct ceph_vino vino;
|
|
ino_t ino;
|
|
|
|
dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
|
|
off, off - fi->offset, rinfo->dir_nr, pos,
|
|
rinfo->dir_dname_len[off - fi->offset],
|
|
rinfo->dir_dname[off - fi->offset], in);
|
|
BUG_ON(!in);
|
|
ftype = le32_to_cpu(in->mode) >> 12;
|
|
vino.ino = le64_to_cpu(in->ino);
|
|
vino.snap = le64_to_cpu(in->snapid);
|
|
ino = ceph_vino_to_ino(vino);
|
|
if (filldir(dirent,
|
|
rinfo->dir_dname[off - fi->offset],
|
|
rinfo->dir_dname_len[off - fi->offset],
|
|
pos,
|
|
ceph_translate_ino(inode->i_sb, ino), ftype) < 0) {
|
|
dout("filldir stopping us...\n");
|
|
return 0;
|
|
}
|
|
off++;
|
|
filp->f_pos = pos + 1;
|
|
}
|
|
|
|
if (fi->last_name) {
|
|
ceph_mdsc_put_request(fi->last_readdir);
|
|
fi->last_readdir = NULL;
|
|
goto more;
|
|
}
|
|
|
|
/* more frags? */
|
|
if (!ceph_frag_is_rightmost(frag)) {
|
|
frag = ceph_frag_next(frag);
|
|
off = 0;
|
|
filp->f_pos = ceph_make_fpos(frag, off);
|
|
dout("readdir next frag is %x\n", frag);
|
|
goto more;
|
|
}
|
|
fi->at_end = 1;
|
|
|
|
/*
|
|
* if dir_release_count still matches the dir, no dentries
|
|
* were released during the whole readdir, and we should have
|
|
* the complete dir contents in our cache.
|
|
*/
|
|
spin_lock(&inode->i_lock);
|
|
if (ci->i_release_count == fi->dir_release_count) {
|
|
dout(" marking %p complete\n", inode);
|
|
/* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
|
|
ci->i_max_offset = filp->f_pos;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
dout("readdir %p filp %p done.\n", inode, filp);
|
|
return 0;
|
|
}
|
|
|
|
static void reset_readdir(struct ceph_file_info *fi)
|
|
{
|
|
if (fi->last_readdir) {
|
|
ceph_mdsc_put_request(fi->last_readdir);
|
|
fi->last_readdir = NULL;
|
|
}
|
|
kfree(fi->last_name);
|
|
fi->last_name = NULL;
|
|
fi->next_offset = 2; /* compensate for . and .. */
|
|
if (fi->dentry) {
|
|
dput(fi->dentry);
|
|
fi->dentry = NULL;
|
|
}
|
|
fi->at_end = 0;
|
|
}
|
|
|
|
static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
|
|
{
|
|
struct ceph_file_info *fi = file->private_data;
|
|
struct inode *inode = file->f_mapping->host;
|
|
loff_t old_offset = offset;
|
|
loff_t retval;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
switch (origin) {
|
|
case SEEK_END:
|
|
offset += inode->i_size + 2; /* FIXME */
|
|
break;
|
|
case SEEK_CUR:
|
|
offset += file->f_pos;
|
|
}
|
|
retval = -EINVAL;
|
|
if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
|
|
if (offset != file->f_pos) {
|
|
file->f_pos = offset;
|
|
file->f_version = 0;
|
|
fi->at_end = 0;
|
|
}
|
|
retval = offset;
|
|
|
|
/*
|
|
* discard buffered readdir content on seekdir(0), or
|
|
* seek to new frag, or seek prior to current chunk.
|
|
*/
|
|
if (offset == 0 ||
|
|
fpos_frag(offset) != fpos_frag(old_offset) ||
|
|
fpos_off(offset) < fi->offset) {
|
|
dout("dir_llseek dropping %p content\n", file);
|
|
reset_readdir(fi);
|
|
}
|
|
|
|
/* bump dir_release_count if we did a forward seek */
|
|
if (offset > old_offset)
|
|
fi->dir_release_count--;
|
|
}
|
|
mutex_unlock(&inode->i_mutex);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Process result of a lookup/open request.
|
|
*
|
|
* Mainly, make sure we return the final req->r_dentry (if it already
|
|
* existed) in place of the original VFS-provided dentry when they
|
|
* differ.
|
|
*
|
|
* Gracefully handle the case where the MDS replies with -ENOENT and
|
|
* no trace (which it may do, at its discretion, e.g., if it doesn't
|
|
* care to issue a lease on the negative dentry).
|
|
*/
|
|
struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
|
|
struct dentry *dentry, int err)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
|
|
struct inode *parent = dentry->d_parent->d_inode;
|
|
|
|
/* .snap dir? */
|
|
if (err == -ENOENT &&
|
|
ceph_snap(parent) == CEPH_NOSNAP &&
|
|
strcmp(dentry->d_name.name,
|
|
fsc->mount_options->snapdir_name) == 0) {
|
|
struct inode *inode = ceph_get_snapdir(parent);
|
|
dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
|
|
dentry, dentry->d_name.len, dentry->d_name.name, inode);
|
|
BUG_ON(!d_unhashed(dentry));
|
|
d_add(dentry, inode);
|
|
err = 0;
|
|
}
|
|
|
|
if (err == -ENOENT) {
|
|
/* no trace? */
|
|
err = 0;
|
|
if (!req->r_reply_info.head->is_dentry) {
|
|
dout("ENOENT and no trace, dentry %p inode %p\n",
|
|
dentry, dentry->d_inode);
|
|
if (dentry->d_inode) {
|
|
d_drop(dentry);
|
|
err = -ENOENT;
|
|
} else {
|
|
d_add(dentry, NULL);
|
|
}
|
|
}
|
|
}
|
|
if (err)
|
|
dentry = ERR_PTR(err);
|
|
else if (dentry != req->r_dentry)
|
|
dentry = dget(req->r_dentry); /* we got spliced */
|
|
else
|
|
dentry = NULL;
|
|
return dentry;
|
|
}
|
|
|
|
static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
|
|
{
|
|
return ceph_ino(inode) == CEPH_INO_ROOT &&
|
|
strncmp(dentry->d_name.name, ".ceph", 5) == 0;
|
|
}
|
|
|
|
/*
|
|
* Look up a single dir entry. If there is a lookup intent, inform
|
|
* the MDS so that it gets our 'caps wanted' value in a single op.
|
|
*/
|
|
static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
|
|
struct nameidata *nd)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int op;
|
|
int err;
|
|
|
|
dout("lookup %p dentry %p '%.*s'\n",
|
|
dir, dentry, dentry->d_name.len, dentry->d_name.name);
|
|
|
|
if (dentry->d_name.len > NAME_MAX)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
err = ceph_init_dentry(dentry);
|
|
if (err < 0)
|
|
return ERR_PTR(err);
|
|
|
|
/* open (but not create!) intent? */
|
|
if (nd &&
|
|
(nd->flags & LOOKUP_OPEN) &&
|
|
(nd->flags & LOOKUP_CONTINUE) == 0 && /* only open last component */
|
|
!(nd->intent.open.flags & O_CREAT)) {
|
|
int mode = nd->intent.open.create_mode & ~current->fs->umask;
|
|
return ceph_lookup_open(dir, dentry, nd, mode, 1);
|
|
}
|
|
|
|
/* can we conclude ENOENT locally? */
|
|
if (dentry->d_inode == NULL) {
|
|
struct ceph_inode_info *ci = ceph_inode(dir);
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
|
|
spin_lock(&dir->i_lock);
|
|
dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
|
|
if (strncmp(dentry->d_name.name,
|
|
fsc->mount_options->snapdir_name,
|
|
dentry->d_name.len) &&
|
|
!is_root_ceph_dentry(dir, dentry) &&
|
|
(ci->i_ceph_flags & CEPH_I_COMPLETE) &&
|
|
(__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
|
|
spin_unlock(&dir->i_lock);
|
|
dout(" dir %p complete, -ENOENT\n", dir);
|
|
d_add(dentry, NULL);
|
|
di->lease_shared_gen = ci->i_shared_gen;
|
|
return NULL;
|
|
}
|
|
spin_unlock(&dir->i_lock);
|
|
}
|
|
|
|
op = ceph_snap(dir) == CEPH_SNAPDIR ?
|
|
CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
|
|
req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
|
|
if (IS_ERR(req))
|
|
return ERR_CAST(req);
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
/* we only need inode linkage */
|
|
req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
|
|
req->r_locked_dir = dir;
|
|
err = ceph_mdsc_do_request(mdsc, NULL, req);
|
|
dentry = ceph_finish_lookup(req, dentry, err);
|
|
ceph_mdsc_put_request(req); /* will dput(dentry) */
|
|
dout("lookup result=%p\n", dentry);
|
|
return dentry;
|
|
}
|
|
|
|
/*
|
|
* If we do a create but get no trace back from the MDS, follow up with
|
|
* a lookup (the VFS expects us to link up the provided dentry).
|
|
*/
|
|
int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct dentry *result = ceph_lookup(dir, dentry, NULL);
|
|
|
|
if (result && !IS_ERR(result)) {
|
|
/*
|
|
* We created the item, then did a lookup, and found
|
|
* it was already linked to another inode we already
|
|
* had in our cache (and thus got spliced). Link our
|
|
* dentry to that inode, but don't hash it, just in
|
|
* case the VFS wants to dereference it.
|
|
*/
|
|
BUG_ON(!result->d_inode);
|
|
d_instantiate(dentry, result->d_inode);
|
|
return 0;
|
|
}
|
|
return PTR_ERR(result);
|
|
}
|
|
|
|
static int ceph_mknod(struct inode *dir, struct dentry *dentry,
|
|
int mode, dev_t rdev)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int err;
|
|
|
|
if (ceph_snap(dir) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
dout("mknod in dir %p dentry %p mode 0%o rdev %d\n",
|
|
dir, dentry, mode, rdev);
|
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
d_drop(dentry);
|
|
return PTR_ERR(req);
|
|
}
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_locked_dir = dir;
|
|
req->r_args.mknod.mode = cpu_to_le32(mode);
|
|
req->r_args.mknod.rdev = cpu_to_le32(rdev);
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
err = ceph_mdsc_do_request(mdsc, dir, req);
|
|
if (!err && !req->r_reply_info.head->is_dentry)
|
|
err = ceph_handle_notrace_create(dir, dentry);
|
|
ceph_mdsc_put_request(req);
|
|
if (err)
|
|
d_drop(dentry);
|
|
return err;
|
|
}
|
|
|
|
static int ceph_create(struct inode *dir, struct dentry *dentry, int mode,
|
|
struct nameidata *nd)
|
|
{
|
|
dout("create in dir %p dentry %p name '%.*s'\n",
|
|
dir, dentry, dentry->d_name.len, dentry->d_name.name);
|
|
|
|
if (ceph_snap(dir) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
if (nd) {
|
|
BUG_ON((nd->flags & LOOKUP_OPEN) == 0);
|
|
dentry = ceph_lookup_open(dir, dentry, nd, mode, 0);
|
|
/* hrm, what should i do here if we get aliased? */
|
|
if (IS_ERR(dentry))
|
|
return PTR_ERR(dentry);
|
|
return 0;
|
|
}
|
|
|
|
/* fall back to mknod */
|
|
return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0);
|
|
}
|
|
|
|
static int ceph_symlink(struct inode *dir, struct dentry *dentry,
|
|
const char *dest)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int err;
|
|
|
|
if (ceph_snap(dir) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
|
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
d_drop(dentry);
|
|
return PTR_ERR(req);
|
|
}
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_path2 = kstrdup(dest, GFP_NOFS);
|
|
req->r_locked_dir = dir;
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
err = ceph_mdsc_do_request(mdsc, dir, req);
|
|
if (!err && !req->r_reply_info.head->is_dentry)
|
|
err = ceph_handle_notrace_create(dir, dentry);
|
|
ceph_mdsc_put_request(req);
|
|
if (err)
|
|
d_drop(dentry);
|
|
return err;
|
|
}
|
|
|
|
static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int err = -EROFS;
|
|
int op;
|
|
|
|
if (ceph_snap(dir) == CEPH_SNAPDIR) {
|
|
/* mkdir .snap/foo is a MKSNAP */
|
|
op = CEPH_MDS_OP_MKSNAP;
|
|
dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
|
|
dentry->d_name.len, dentry->d_name.name, dentry);
|
|
} else if (ceph_snap(dir) == CEPH_NOSNAP) {
|
|
dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode);
|
|
op = CEPH_MDS_OP_MKDIR;
|
|
} else {
|
|
goto out;
|
|
}
|
|
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_locked_dir = dir;
|
|
req->r_args.mkdir.mode = cpu_to_le32(mode);
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
err = ceph_mdsc_do_request(mdsc, dir, req);
|
|
if (!err && !req->r_reply_info.head->is_dentry)
|
|
err = ceph_handle_notrace_create(dir, dentry);
|
|
ceph_mdsc_put_request(req);
|
|
out:
|
|
if (err < 0)
|
|
d_drop(dentry);
|
|
return err;
|
|
}
|
|
|
|
static int ceph_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int err;
|
|
|
|
if (ceph_snap(dir) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
dout("link in dir %p old_dentry %p dentry %p\n", dir,
|
|
old_dentry, dentry);
|
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
d_drop(dentry);
|
|
return PTR_ERR(req);
|
|
}
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */
|
|
req->r_locked_dir = dir;
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
err = ceph_mdsc_do_request(mdsc, dir, req);
|
|
if (err) {
|
|
d_drop(dentry);
|
|
} else if (!req->r_reply_info.head->is_dentry) {
|
|
ihold(old_dentry->d_inode);
|
|
d_instantiate(dentry, old_dentry->d_inode);
|
|
}
|
|
ceph_mdsc_put_request(req);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
|
|
* looks like the link count will hit 0, drop any other caps (other
|
|
* than PIN) we don't specifically want (due to the file still being
|
|
* open).
|
|
*/
|
|
static int drop_caps_for_unlink(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (inode->i_nlink == 1) {
|
|
drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
|
|
ci->i_ceph_flags |= CEPH_I_NODELAY;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
return drop;
|
|
}
|
|
|
|
/*
|
|
* rmdir and unlink are differ only by the metadata op code
|
|
*/
|
|
static int ceph_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct ceph_mds_request *req;
|
|
int err = -EROFS;
|
|
int op;
|
|
|
|
if (ceph_snap(dir) == CEPH_SNAPDIR) {
|
|
/* rmdir .snap/foo is RMSNAP */
|
|
dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
|
|
dentry->d_name.name, dentry);
|
|
op = CEPH_MDS_OP_RMSNAP;
|
|
} else if (ceph_snap(dir) == CEPH_NOSNAP) {
|
|
dout("unlink/rmdir dir %p dn %p inode %p\n",
|
|
dir, dentry, inode);
|
|
op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ?
|
|
CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
|
|
} else
|
|
goto out;
|
|
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_locked_dir = dir;
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
req->r_inode_drop = drop_caps_for_unlink(inode);
|
|
err = ceph_mdsc_do_request(mdsc, dir, req);
|
|
if (!err && !req->r_reply_info.head->is_dentry)
|
|
d_delete(dentry);
|
|
ceph_mdsc_put_request(req);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int err;
|
|
|
|
if (ceph_snap(old_dir) != ceph_snap(new_dir))
|
|
return -EXDEV;
|
|
if (ceph_snap(old_dir) != CEPH_NOSNAP ||
|
|
ceph_snap(new_dir) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
dout("rename dir %p dentry %p to dir %p dentry %p\n",
|
|
old_dir, old_dentry, new_dir, new_dentry);
|
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
req->r_dentry = dget(new_dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_old_dentry = dget(old_dentry);
|
|
req->r_locked_dir = new_dir;
|
|
req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
/* release LINK_RDCACHE on source inode (mds will lock it) */
|
|
req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
|
|
if (new_dentry->d_inode)
|
|
req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
|
|
err = ceph_mdsc_do_request(mdsc, old_dir, req);
|
|
if (!err && !req->r_reply_info.head->is_dentry) {
|
|
/*
|
|
* Normally d_move() is done by fill_trace (called by
|
|
* do_request, above). If there is no trace, we need
|
|
* to do it here.
|
|
*/
|
|
|
|
/* d_move screws up d_subdirs order */
|
|
ceph_i_clear(new_dir, CEPH_I_COMPLETE);
|
|
|
|
d_move(old_dentry, new_dentry);
|
|
|
|
/* ensure target dentry is invalidated, despite
|
|
rehashing bug in vfs_rename_dir */
|
|
ceph_invalidate_dentry_lease(new_dentry);
|
|
}
|
|
ceph_mdsc_put_request(req);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Ensure a dentry lease will no longer revalidate.
|
|
*/
|
|
void ceph_invalidate_dentry_lease(struct dentry *dentry)
|
|
{
|
|
spin_lock(&dentry->d_lock);
|
|
dentry->d_time = jiffies;
|
|
ceph_dentry(dentry)->lease_shared_gen = 0;
|
|
spin_unlock(&dentry->d_lock);
|
|
}
|
|
|
|
/*
|
|
* Check if dentry lease is valid. If not, delete the lease. Try to
|
|
* renew if the least is more than half up.
|
|
*/
|
|
static int dentry_lease_is_valid(struct dentry *dentry)
|
|
{
|
|
struct ceph_dentry_info *di;
|
|
struct ceph_mds_session *s;
|
|
int valid = 0;
|
|
u32 gen;
|
|
unsigned long ttl;
|
|
struct ceph_mds_session *session = NULL;
|
|
struct inode *dir = NULL;
|
|
u32 seq = 0;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
di = ceph_dentry(dentry);
|
|
if (di && di->lease_session) {
|
|
s = di->lease_session;
|
|
spin_lock(&s->s_cap_lock);
|
|
gen = s->s_cap_gen;
|
|
ttl = s->s_cap_ttl;
|
|
spin_unlock(&s->s_cap_lock);
|
|
|
|
if (di->lease_gen == gen &&
|
|
time_before(jiffies, dentry->d_time) &&
|
|
time_before(jiffies, ttl)) {
|
|
valid = 1;
|
|
if (di->lease_renew_after &&
|
|
time_after(jiffies, di->lease_renew_after)) {
|
|
/* we should renew */
|
|
dir = dentry->d_parent->d_inode;
|
|
session = ceph_get_mds_session(s);
|
|
seq = di->lease_seq;
|
|
di->lease_renew_after = 0;
|
|
di->lease_renew_from = jiffies;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
if (session) {
|
|
ceph_mdsc_lease_send_msg(session, dir, dentry,
|
|
CEPH_MDS_LEASE_RENEW, seq);
|
|
ceph_put_mds_session(session);
|
|
}
|
|
dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
|
|
return valid;
|
|
}
|
|
|
|
/*
|
|
* Check if directory-wide content lease/cap is valid.
|
|
*/
|
|
static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(dir);
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
int valid = 0;
|
|
|
|
spin_lock(&dir->i_lock);
|
|
if (ci->i_shared_gen == di->lease_shared_gen)
|
|
valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
|
|
spin_unlock(&dir->i_lock);
|
|
dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
|
|
dir, (unsigned)ci->i_shared_gen, dentry,
|
|
(unsigned)di->lease_shared_gen, valid);
|
|
return valid;
|
|
}
|
|
|
|
/*
|
|
* Check if cached dentry can be trusted.
|
|
*/
|
|
static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct inode *dir;
|
|
|
|
if (nd && nd->flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
dir = dentry->d_parent->d_inode;
|
|
|
|
dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
|
|
dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
|
|
ceph_dentry(dentry)->offset);
|
|
|
|
/* always trust cached snapped dentries, snapdir dentry */
|
|
if (ceph_snap(dir) != CEPH_NOSNAP) {
|
|
dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
|
|
dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
|
|
goto out_touch;
|
|
}
|
|
if (dentry->d_inode && ceph_snap(dentry->d_inode) == CEPH_SNAPDIR)
|
|
goto out_touch;
|
|
|
|
if (dentry_lease_is_valid(dentry) ||
|
|
dir_lease_is_valid(dir, dentry))
|
|
goto out_touch;
|
|
|
|
dout("d_revalidate %p invalid\n", dentry);
|
|
d_drop(dentry);
|
|
return 0;
|
|
out_touch:
|
|
ceph_dentry_lru_touch(dentry);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Release our ceph_dentry_info.
|
|
*/
|
|
static void ceph_d_release(struct dentry *dentry)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
|
|
dout("d_release %p\n", dentry);
|
|
if (di) {
|
|
ceph_dentry_lru_del(dentry);
|
|
if (di->lease_session)
|
|
ceph_put_mds_session(di->lease_session);
|
|
kmem_cache_free(ceph_dentry_cachep, di);
|
|
dentry->d_fsdata = NULL;
|
|
}
|
|
}
|
|
|
|
static int ceph_snapdir_d_revalidate(struct dentry *dentry,
|
|
struct nameidata *nd)
|
|
{
|
|
/*
|
|
* Eventually, we'll want to revalidate snapped metadata
|
|
* too... probably...
|
|
*/
|
|
return 1;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* read() on a dir. This weird interface hack only works if mounted
|
|
* with '-o dirstat'.
|
|
*/
|
|
static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
|
|
loff_t *ppos)
|
|
{
|
|
struct ceph_file_info *cf = file->private_data;
|
|
struct inode *inode = file->f_dentry->d_inode;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int left;
|
|
const int bufsize = 1024;
|
|
|
|
if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
|
|
return -EISDIR;
|
|
|
|
if (!cf->dir_info) {
|
|
cf->dir_info = kmalloc(bufsize, GFP_NOFS);
|
|
if (!cf->dir_info)
|
|
return -ENOMEM;
|
|
cf->dir_info_len =
|
|
snprintf(cf->dir_info, bufsize,
|
|
"entries: %20lld\n"
|
|
" files: %20lld\n"
|
|
" subdirs: %20lld\n"
|
|
"rentries: %20lld\n"
|
|
" rfiles: %20lld\n"
|
|
" rsubdirs: %20lld\n"
|
|
"rbytes: %20lld\n"
|
|
"rctime: %10ld.%09ld\n",
|
|
ci->i_files + ci->i_subdirs,
|
|
ci->i_files,
|
|
ci->i_subdirs,
|
|
ci->i_rfiles + ci->i_rsubdirs,
|
|
ci->i_rfiles,
|
|
ci->i_rsubdirs,
|
|
ci->i_rbytes,
|
|
(long)ci->i_rctime.tv_sec,
|
|
(long)ci->i_rctime.tv_nsec);
|
|
}
|
|
|
|
if (*ppos >= cf->dir_info_len)
|
|
return 0;
|
|
size = min_t(unsigned, size, cf->dir_info_len-*ppos);
|
|
left = copy_to_user(buf, cf->dir_info + *ppos, size);
|
|
if (left == size)
|
|
return -EFAULT;
|
|
*ppos += (size - left);
|
|
return size - left;
|
|
}
|
|
|
|
/*
|
|
* an fsync() on a dir will wait for any uncommitted directory
|
|
* operations to commit.
|
|
*/
|
|
static int ceph_dir_fsync(struct file *file, int datasync)
|
|
{
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct list_head *head = &ci->i_unsafe_dirops;
|
|
struct ceph_mds_request *req;
|
|
u64 last_tid;
|
|
int ret = 0;
|
|
|
|
dout("dir_fsync %p\n", inode);
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
if (list_empty(head))
|
|
goto out;
|
|
|
|
req = list_entry(head->prev,
|
|
struct ceph_mds_request, r_unsafe_dir_item);
|
|
last_tid = req->r_tid;
|
|
|
|
do {
|
|
ceph_mdsc_get_request(req);
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
dout("dir_fsync %p wait on tid %llu (until %llu)\n",
|
|
inode, req->r_tid, last_tid);
|
|
if (req->r_timeout) {
|
|
ret = wait_for_completion_timeout(
|
|
&req->r_safe_completion, req->r_timeout);
|
|
if (ret > 0)
|
|
ret = 0;
|
|
else if (ret == 0)
|
|
ret = -EIO; /* timed out */
|
|
} else {
|
|
wait_for_completion(&req->r_safe_completion);
|
|
}
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
ceph_mdsc_put_request(req);
|
|
|
|
if (ret || list_empty(head))
|
|
break;
|
|
req = list_entry(head->next,
|
|
struct ceph_mds_request, r_unsafe_dir_item);
|
|
} while (req->r_tid < last_tid);
|
|
out:
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* We maintain a private dentry LRU.
|
|
*
|
|
* FIXME: this needs to be changed to a per-mds lru to be useful.
|
|
*/
|
|
void ceph_dentry_lru_add(struct dentry *dn)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dn);
|
|
struct ceph_mds_client *mdsc;
|
|
|
|
dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
|
|
dn->d_name.len, dn->d_name.name);
|
|
if (di) {
|
|
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
|
|
spin_lock(&mdsc->dentry_lru_lock);
|
|
list_add_tail(&di->lru, &mdsc->dentry_lru);
|
|
mdsc->num_dentry++;
|
|
spin_unlock(&mdsc->dentry_lru_lock);
|
|
}
|
|
}
|
|
|
|
void ceph_dentry_lru_touch(struct dentry *dn)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dn);
|
|
struct ceph_mds_client *mdsc;
|
|
|
|
dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
|
|
dn->d_name.len, dn->d_name.name, di->offset);
|
|
if (di) {
|
|
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
|
|
spin_lock(&mdsc->dentry_lru_lock);
|
|
list_move_tail(&di->lru, &mdsc->dentry_lru);
|
|
spin_unlock(&mdsc->dentry_lru_lock);
|
|
}
|
|
}
|
|
|
|
void ceph_dentry_lru_del(struct dentry *dn)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dn);
|
|
struct ceph_mds_client *mdsc;
|
|
|
|
dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
|
|
dn->d_name.len, dn->d_name.name);
|
|
if (di) {
|
|
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
|
|
spin_lock(&mdsc->dentry_lru_lock);
|
|
list_del_init(&di->lru);
|
|
mdsc->num_dentry--;
|
|
spin_unlock(&mdsc->dentry_lru_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return name hash for a given dentry. This is dependent on
|
|
* the parent directory's hash function.
|
|
*/
|
|
unsigned ceph_dentry_hash(struct dentry *dn)
|
|
{
|
|
struct inode *dir = dn->d_parent->d_inode;
|
|
struct ceph_inode_info *dci = ceph_inode(dir);
|
|
|
|
switch (dci->i_dir_layout.dl_dir_hash) {
|
|
case 0: /* for backward compat */
|
|
case CEPH_STR_HASH_LINUX:
|
|
return dn->d_name.hash;
|
|
|
|
default:
|
|
return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
|
|
dn->d_name.name, dn->d_name.len);
|
|
}
|
|
}
|
|
|
|
const struct file_operations ceph_dir_fops = {
|
|
.read = ceph_read_dir,
|
|
.readdir = ceph_readdir,
|
|
.llseek = ceph_dir_llseek,
|
|
.open = ceph_open,
|
|
.release = ceph_release,
|
|
.unlocked_ioctl = ceph_ioctl,
|
|
.fsync = ceph_dir_fsync,
|
|
};
|
|
|
|
const struct inode_operations ceph_dir_iops = {
|
|
.lookup = ceph_lookup,
|
|
.permission = ceph_permission,
|
|
.getattr = ceph_getattr,
|
|
.setattr = ceph_setattr,
|
|
.setxattr = ceph_setxattr,
|
|
.getxattr = ceph_getxattr,
|
|
.listxattr = ceph_listxattr,
|
|
.removexattr = ceph_removexattr,
|
|
.mknod = ceph_mknod,
|
|
.symlink = ceph_symlink,
|
|
.mkdir = ceph_mkdir,
|
|
.link = ceph_link,
|
|
.unlink = ceph_unlink,
|
|
.rmdir = ceph_unlink,
|
|
.rename = ceph_rename,
|
|
.create = ceph_create,
|
|
};
|
|
|
|
const struct dentry_operations ceph_dentry_ops = {
|
|
.d_revalidate = ceph_d_revalidate,
|
|
.d_release = ceph_d_release,
|
|
};
|
|
|
|
const struct dentry_operations ceph_snapdir_dentry_ops = {
|
|
.d_revalidate = ceph_snapdir_d_revalidate,
|
|
.d_release = ceph_d_release,
|
|
};
|
|
|
|
const struct dentry_operations ceph_snap_dentry_ops = {
|
|
.d_release = ceph_d_release,
|
|
};
|