1
#include <linux/ceph/ceph_debug.h>
3
#include <linux/spinlock.h>
4
#include <linux/fs_struct.h>
5
#include <linux/namei.h>
6
#include <linux/slab.h>
7
#include <linux/sched.h>
10
#include "mds_client.h"
13
* Directory operations: readdir, lookup, create, link, unlink,
18
* Ceph MDS operations are specified in terms of a base ino and
19
* relative path. Thus, the client can specify an operation on a
20
* specific inode (e.g., a getattr due to fstat(2)), or as a path
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* relative to, say, the root directory.
23
* Normally, we limit ourselves to strict inode ops (no path component)
24
* or dentry operations (a single path component relative to an ino). The
25
* exception to this is open_root_dentry(), which will open the mount
29
const struct inode_operations ceph_dir_iops;
30
const struct file_operations ceph_dir_fops;
31
const struct dentry_operations ceph_dentry_ops;
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* Initialize ceph dentry state.
36
int ceph_init_dentry(struct dentry *dentry)
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struct ceph_dentry_info *di;
43
di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
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return -ENOMEM; /* oh well */
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spin_lock(&dentry->d_lock);
48
if (dentry->d_fsdata) {
50
kmem_cache_free(ceph_dentry_cachep, di);
54
if (dentry->d_parent == NULL || /* nfs fh_to_dentry */
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ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
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d_set_d_op(dentry, &ceph_dentry_ops);
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else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
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d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
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d_set_d_op(dentry, &ceph_snap_dentry_ops);
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di->lease_session = NULL;
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dentry->d_time = jiffies;
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/* avoid reordering d_fsdata setup so that the check above is safe */
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dentry->d_fsdata = di;
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ceph_dentry_lru_add(dentry);
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spin_unlock(&dentry->d_lock);
74
struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
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struct inode *inode = NULL;
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spin_lock(&dentry->d_lock);
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if (dentry->d_parent) {
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inode = dentry->d_parent->d_inode;
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spin_unlock(&dentry->d_lock);
92
* for readdir, we encode the directory frag and offset within that
95
static unsigned fpos_frag(loff_t p)
99
static unsigned fpos_off(loff_t p)
101
return p & 0xffffffff;
105
* When possible, we try to satisfy a readdir by peeking at the
106
* dcache. We make this work by carefully ordering dentries on
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* d_u.d_child when we initially get results back from the MDS, and
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* falling back to a "normal" sync readdir if any dentries in the dir
111
* D_COMPLETE tells indicates we have all dentries in the dir. It is
112
* defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
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* the MDS if/when the directory is modified).
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static int __dcache_readdir(struct file *filp,
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void *dirent, filldir_t filldir)
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struct ceph_file_info *fi = filp->private_data;
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struct dentry *parent = filp->f_dentry;
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struct inode *dir = parent->d_inode;
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struct dentry *dentry, *last;
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struct ceph_dentry_info *di;
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/* claim ref on last dentry we returned */
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dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos,
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spin_lock(&parent->d_lock);
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/* start at beginning? */
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if (filp->f_pos == 2 || last == NULL ||
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filp->f_pos < ceph_dentry(last)->offset) {
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if (list_empty(&parent->d_subdirs))
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p = parent->d_subdirs.prev;
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dout(" initial p %p/%p\n", p->prev, p->next);
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p = last->d_u.d_child.prev;
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dentry = list_entry(p, struct dentry, d_u.d_child);
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di = ceph_dentry(dentry);
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dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
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d_unhashed(dentry) ? "!hashed" : "hashed",
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parent->d_subdirs.prev, parent->d_subdirs.next);
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if (p == &parent->d_subdirs) {
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fi->flags |= CEPH_F_ATEND;
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spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
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if (!d_unhashed(dentry) && dentry->d_inode &&
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ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
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ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
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filp->f_pos <= di->offset)
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dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
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dentry->d_name.len, dentry->d_name.name, di->offset,
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filp->f_pos, d_unhashed(dentry) ? " unhashed" : "",
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!dentry->d_inode ? " null" : "");
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spin_unlock(&dentry->d_lock);
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dentry = list_entry(p, struct dentry, d_u.d_child);
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di = ceph_dentry(dentry);
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spin_unlock(&dentry->d_lock);
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spin_unlock(&parent->d_lock);
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dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos,
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dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
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filp->f_pos = di->offset;
180
err = filldir(dirent, dentry->d_name.name,
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dentry->d_name.len, di->offset,
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ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
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dentry->d_inode->i_mode >> 12);
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/* remember our position */
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fi->next_offset = di->offset;
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/* make sure a dentry wasn't dropped while we didn't have parent lock */
202
if (!ceph_dir_test_complete(dir)) {
203
dout(" lost D_COMPLETE on %p; falling back to mds\n", dir);
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spin_lock(&parent->d_lock);
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p = p->prev; /* advance to next dentry */
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spin_unlock(&parent->d_lock);
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* make note of the last dentry we read, so we can
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* continue at the same lexicographical point,
223
* regardless of what dir changes take place on the
226
static int note_last_dentry(struct ceph_file_info *fi, const char *name,
229
kfree(fi->last_name);
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fi->last_name = kmalloc(len+1, GFP_NOFS);
233
memcpy(fi->last_name, name, len);
234
fi->last_name[len] = 0;
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dout("note_last_dentry '%s'\n", fi->last_name);
239
static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
241
struct ceph_file_info *fi = filp->private_data;
242
struct inode *inode = filp->f_dentry->d_inode;
243
struct ceph_inode_info *ci = ceph_inode(inode);
244
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
245
struct ceph_mds_client *mdsc = fsc->mdsc;
246
unsigned frag = fpos_frag(filp->f_pos);
247
int off = fpos_off(filp->f_pos);
250
struct ceph_mds_reply_info_parsed *rinfo;
251
const int max_entries = fsc->mount_options->max_readdir;
252
const int max_bytes = fsc->mount_options->max_readdir_bytes;
254
dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
255
if (fi->flags & CEPH_F_ATEND)
258
/* always start with . and .. */
259
if (filp->f_pos == 0) {
260
/* note dir version at start of readdir so we can tell
261
* if any dentries get dropped */
262
fi->dir_release_count = ci->i_release_count;
264
dout("readdir off 0 -> '.'\n");
265
if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0),
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ceph_translate_ino(inode->i_sb, inode->i_ino),
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inode->i_mode >> 12) < 0)
272
if (filp->f_pos == 1) {
273
ino_t ino = parent_ino(filp->f_dentry);
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dout("readdir off 1 -> '..'\n");
275
if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1),
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ceph_translate_ino(inode->i_sb, ino),
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inode->i_mode >> 12) < 0)
283
/* can we use the dcache? */
284
spin_lock(&ci->i_ceph_lock);
285
if ((filp->f_pos == 2 || fi->dentry) &&
286
!ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
287
ceph_snap(inode) != CEPH_SNAPDIR &&
288
ceph_dir_test_complete(inode) &&
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__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
290
spin_unlock(&ci->i_ceph_lock);
291
err = __dcache_readdir(filp, dirent, filldir);
295
spin_unlock(&ci->i_ceph_lock);
298
err = note_last_dentry(fi, fi->dentry->d_name.name,
299
fi->dentry->d_name.len);
306
/* proceed with a normal readdir */
309
/* do we have the correct frag content buffered? */
310
if (fi->frag != frag || fi->last_readdir == NULL) {
311
struct ceph_mds_request *req;
312
int op = ceph_snap(inode) == CEPH_SNAPDIR ?
313
CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
315
/* discard old result, if any */
316
if (fi->last_readdir) {
317
ceph_mdsc_put_request(fi->last_readdir);
318
fi->last_readdir = NULL;
321
/* requery frag tree, as the frag topology may have changed */
322
frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);
324
dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
325
ceph_vinop(inode), frag, fi->last_name);
326
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
329
req->r_inode = inode;
331
req->r_dentry = dget(filp->f_dentry);
332
/* hints to request -> mds selection code */
333
req->r_direct_mode = USE_AUTH_MDS;
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req->r_direct_hash = ceph_frag_value(frag);
335
req->r_direct_is_hash = true;
336
req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
337
req->r_readdir_offset = fi->next_offset;
338
req->r_args.readdir.frag = cpu_to_le32(frag);
339
req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
340
req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
341
req->r_num_caps = max_entries + 1;
342
err = ceph_mdsc_do_request(mdsc, NULL, req);
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ceph_mdsc_put_request(req);
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dout("readdir got and parsed readdir result=%d"
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" on frag %x, end=%d, complete=%d\n", err, frag,
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(int)req->r_reply_info.dir_end,
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(int)req->r_reply_info.dir_complete);
352
if (!req->r_did_prepopulate) {
353
dout("readdir !did_prepopulate");
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fi->dir_release_count--; /* preclude D_COMPLETE */
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/* note next offset and last dentry name */
358
fi->offset = fi->next_offset;
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fi->last_readdir = req;
361
if (req->r_reply_info.dir_end) {
362
kfree(fi->last_name);
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fi->last_name = NULL;
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if (ceph_frag_is_rightmost(frag))
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rinfo = &req->r_reply_info;
370
err = note_last_dentry(fi,
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rinfo->dir_dname[rinfo->dir_nr-1],
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rinfo->dir_dname_len[rinfo->dir_nr-1]);
375
fi->next_offset += rinfo->dir_nr;
379
rinfo = &fi->last_readdir->r_reply_info;
380
dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
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rinfo->dir_nr, off, fi->offset);
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while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
383
u64 pos = ceph_make_fpos(frag, off);
384
struct ceph_mds_reply_inode *in =
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rinfo->dir_in[off - fi->offset].in;
386
struct ceph_vino vino;
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dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
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off, off - fi->offset, rinfo->dir_nr, pos,
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rinfo->dir_dname_len[off - fi->offset],
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rinfo->dir_dname[off - fi->offset], in);
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ftype = le32_to_cpu(in->mode) >> 12;
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vino.ino = le64_to_cpu(in->ino);
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vino.snap = le64_to_cpu(in->snapid);
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ino = ceph_vino_to_ino(vino);
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rinfo->dir_dname[off - fi->offset],
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rinfo->dir_dname_len[off - fi->offset],
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ceph_translate_ino(inode->i_sb, ino), ftype) < 0) {
403
dout("filldir stopping us...\n");
407
filp->f_pos = pos + 1;
411
ceph_mdsc_put_request(fi->last_readdir);
412
fi->last_readdir = NULL;
417
if (!ceph_frag_is_rightmost(frag)) {
418
frag = ceph_frag_next(frag);
420
filp->f_pos = ceph_make_fpos(frag, off);
421
dout("readdir next frag is %x\n", frag);
424
fi->flags |= CEPH_F_ATEND;
427
* if dir_release_count still matches the dir, no dentries
428
* were released during the whole readdir, and we should have
429
* the complete dir contents in our cache.
431
spin_lock(&ci->i_ceph_lock);
432
if (ci->i_release_count == fi->dir_release_count) {
433
ceph_dir_set_complete(inode);
434
ci->i_max_offset = filp->f_pos;
436
spin_unlock(&ci->i_ceph_lock);
438
dout("readdir %p filp %p done.\n", inode, filp);
442
static void reset_readdir(struct ceph_file_info *fi)
444
if (fi->last_readdir) {
445
ceph_mdsc_put_request(fi->last_readdir);
446
fi->last_readdir = NULL;
448
kfree(fi->last_name);
449
fi->last_name = NULL;
450
fi->next_offset = 2; /* compensate for . and .. */
455
fi->flags &= ~CEPH_F_ATEND;
458
static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
460
struct ceph_file_info *fi = file->private_data;
461
struct inode *inode = file->f_mapping->host;
462
loff_t old_offset = offset;
465
mutex_lock(&inode->i_mutex);
469
offset += inode->i_size + 2; /* FIXME */
472
offset += file->f_pos;
479
if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
480
if (offset != file->f_pos) {
481
file->f_pos = offset;
483
fi->flags &= ~CEPH_F_ATEND;
488
* discard buffered readdir content on seekdir(0), or
489
* seek to new frag, or seek prior to current chunk.
492
fpos_frag(offset) != fpos_frag(old_offset) ||
493
fpos_off(offset) < fi->offset) {
494
dout("dir_llseek dropping %p content\n", file);
498
/* bump dir_release_count if we did a forward seek */
499
if (offset > old_offset)
500
fi->dir_release_count--;
503
mutex_unlock(&inode->i_mutex);
508
* Handle lookups for the hidden .snap directory.
510
int ceph_handle_snapdir(struct ceph_mds_request *req,
511
struct dentry *dentry, int err)
513
struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
514
struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */
517
if (err == -ENOENT &&
518
ceph_snap(parent) == CEPH_NOSNAP &&
519
strcmp(dentry->d_name.name,
520
fsc->mount_options->snapdir_name) == 0) {
521
struct inode *inode = ceph_get_snapdir(parent);
522
dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
523
dentry, dentry->d_name.len, dentry->d_name.name, inode);
524
BUG_ON(!d_unhashed(dentry));
525
d_add(dentry, inode);
532
* Figure out final result of a lookup/open request.
534
* Mainly, make sure we return the final req->r_dentry (if it already
535
* existed) in place of the original VFS-provided dentry when they
538
* Gracefully handle the case where the MDS replies with -ENOENT and
539
* no trace (which it may do, at its discretion, e.g., if it doesn't
540
* care to issue a lease on the negative dentry).
542
struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
543
struct dentry *dentry, int err)
545
if (err == -ENOENT) {
548
if (!req->r_reply_info.head->is_dentry) {
549
dout("ENOENT and no trace, dentry %p inode %p\n",
550
dentry, dentry->d_inode);
551
if (dentry->d_inode) {
560
dentry = ERR_PTR(err);
561
else if (dentry != req->r_dentry)
562
dentry = dget(req->r_dentry); /* we got spliced */
568
static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
570
return ceph_ino(inode) == CEPH_INO_ROOT &&
571
strncmp(dentry->d_name.name, ".ceph", 5) == 0;
575
* Look up a single dir entry. If there is a lookup intent, inform
576
* the MDS so that it gets our 'caps wanted' value in a single op.
578
static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
579
struct nameidata *nd)
581
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
582
struct ceph_mds_client *mdsc = fsc->mdsc;
583
struct ceph_mds_request *req;
587
dout("lookup %p dentry %p '%.*s'\n",
588
dir, dentry, dentry->d_name.len, dentry->d_name.name);
590
if (dentry->d_name.len > NAME_MAX)
591
return ERR_PTR(-ENAMETOOLONG);
593
err = ceph_init_dentry(dentry);
597
/* open (but not create!) intent? */
599
(nd->flags & LOOKUP_OPEN) &&
600
!(nd->intent.open.flags & O_CREAT)) {
601
int mode = nd->intent.open.create_mode & ~current->fs->umask;
602
return ceph_lookup_open(dir, dentry, nd, mode, 1);
605
/* can we conclude ENOENT locally? */
606
if (dentry->d_inode == NULL) {
607
struct ceph_inode_info *ci = ceph_inode(dir);
608
struct ceph_dentry_info *di = ceph_dentry(dentry);
610
spin_lock(&ci->i_ceph_lock);
611
dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
612
if (strncmp(dentry->d_name.name,
613
fsc->mount_options->snapdir_name,
614
dentry->d_name.len) &&
615
!is_root_ceph_dentry(dir, dentry) &&
616
ceph_dir_test_complete(dir) &&
617
(__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
618
spin_unlock(&ci->i_ceph_lock);
619
dout(" dir %p complete, -ENOENT\n", dir);
621
di->lease_shared_gen = ci->i_shared_gen;
624
spin_unlock(&ci->i_ceph_lock);
627
op = ceph_snap(dir) == CEPH_SNAPDIR ?
628
CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
629
req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
631
return ERR_CAST(req);
632
req->r_dentry = dget(dentry);
634
/* we only need inode linkage */
635
req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
636
req->r_locked_dir = dir;
637
err = ceph_mdsc_do_request(mdsc, NULL, req);
638
err = ceph_handle_snapdir(req, dentry, err);
639
dentry = ceph_finish_lookup(req, dentry, err);
640
ceph_mdsc_put_request(req); /* will dput(dentry) */
641
dout("lookup result=%p\n", dentry);
646
* If we do a create but get no trace back from the MDS, follow up with
647
* a lookup (the VFS expects us to link up the provided dentry).
649
int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
651
struct dentry *result = ceph_lookup(dir, dentry, NULL);
653
if (result && !IS_ERR(result)) {
655
* We created the item, then did a lookup, and found
656
* it was already linked to another inode we already
657
* had in our cache (and thus got spliced). Link our
658
* dentry to that inode, but don't hash it, just in
659
* case the VFS wants to dereference it.
661
BUG_ON(!result->d_inode);
662
d_instantiate(dentry, result->d_inode);
665
return PTR_ERR(result);
668
static int ceph_mknod(struct inode *dir, struct dentry *dentry,
669
int mode, dev_t rdev)
671
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
672
struct ceph_mds_client *mdsc = fsc->mdsc;
673
struct ceph_mds_request *req;
676
if (ceph_snap(dir) != CEPH_NOSNAP)
679
dout("mknod in dir %p dentry %p mode 0%o rdev %d\n",
680
dir, dentry, mode, rdev);
681
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
686
req->r_dentry = dget(dentry);
688
req->r_locked_dir = dir;
689
req->r_args.mknod.mode = cpu_to_le32(mode);
690
req->r_args.mknod.rdev = cpu_to_le32(rdev);
691
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
692
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
693
err = ceph_mdsc_do_request(mdsc, dir, req);
694
if (!err && !req->r_reply_info.head->is_dentry)
695
err = ceph_handle_notrace_create(dir, dentry);
696
ceph_mdsc_put_request(req);
702
static int ceph_create(struct inode *dir, struct dentry *dentry, int mode,
703
struct nameidata *nd)
705
dout("create in dir %p dentry %p name '%.*s'\n",
706
dir, dentry, dentry->d_name.len, dentry->d_name.name);
708
if (ceph_snap(dir) != CEPH_NOSNAP)
712
BUG_ON((nd->flags & LOOKUP_OPEN) == 0);
713
dentry = ceph_lookup_open(dir, dentry, nd, mode, 0);
714
/* hrm, what should i do here if we get aliased? */
716
return PTR_ERR(dentry);
720
/* fall back to mknod */
721
return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0);
724
static int ceph_symlink(struct inode *dir, struct dentry *dentry,
727
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
728
struct ceph_mds_client *mdsc = fsc->mdsc;
729
struct ceph_mds_request *req;
732
if (ceph_snap(dir) != CEPH_NOSNAP)
735
dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
736
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
741
req->r_dentry = dget(dentry);
743
req->r_path2 = kstrdup(dest, GFP_NOFS);
744
req->r_locked_dir = dir;
745
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
746
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
747
err = ceph_mdsc_do_request(mdsc, dir, req);
748
if (!err && !req->r_reply_info.head->is_dentry)
749
err = ceph_handle_notrace_create(dir, dentry);
750
ceph_mdsc_put_request(req);
756
static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode)
758
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
759
struct ceph_mds_client *mdsc = fsc->mdsc;
760
struct ceph_mds_request *req;
764
if (ceph_snap(dir) == CEPH_SNAPDIR) {
765
/* mkdir .snap/foo is a MKSNAP */
766
op = CEPH_MDS_OP_MKSNAP;
767
dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
768
dentry->d_name.len, dentry->d_name.name, dentry);
769
} else if (ceph_snap(dir) == CEPH_NOSNAP) {
770
dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode);
771
op = CEPH_MDS_OP_MKDIR;
775
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
781
req->r_dentry = dget(dentry);
783
req->r_locked_dir = dir;
784
req->r_args.mkdir.mode = cpu_to_le32(mode);
785
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
786
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
787
err = ceph_mdsc_do_request(mdsc, dir, req);
788
if (!err && !req->r_reply_info.head->is_dentry)
789
err = ceph_handle_notrace_create(dir, dentry);
790
ceph_mdsc_put_request(req);
797
static int ceph_link(struct dentry *old_dentry, struct inode *dir,
798
struct dentry *dentry)
800
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
801
struct ceph_mds_client *mdsc = fsc->mdsc;
802
struct ceph_mds_request *req;
805
if (ceph_snap(dir) != CEPH_NOSNAP)
808
dout("link in dir %p old_dentry %p dentry %p\n", dir,
810
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
815
req->r_dentry = dget(dentry);
817
req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */
818
req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
819
req->r_locked_dir = dir;
820
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
821
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
822
err = ceph_mdsc_do_request(mdsc, dir, req);
825
} else if (!req->r_reply_info.head->is_dentry) {
826
ihold(old_dentry->d_inode);
827
d_instantiate(dentry, old_dentry->d_inode);
829
ceph_mdsc_put_request(req);
834
* For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
835
* looks like the link count will hit 0, drop any other caps (other
836
* than PIN) we don't specifically want (due to the file still being
839
static int drop_caps_for_unlink(struct inode *inode)
841
struct ceph_inode_info *ci = ceph_inode(inode);
842
int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
844
spin_lock(&ci->i_ceph_lock);
845
if (inode->i_nlink == 1) {
846
drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
847
ci->i_ceph_flags |= CEPH_I_NODELAY;
849
spin_unlock(&ci->i_ceph_lock);
854
* rmdir and unlink are differ only by the metadata op code
856
static int ceph_unlink(struct inode *dir, struct dentry *dentry)
858
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
859
struct ceph_mds_client *mdsc = fsc->mdsc;
860
struct inode *inode = dentry->d_inode;
861
struct ceph_mds_request *req;
865
if (ceph_snap(dir) == CEPH_SNAPDIR) {
866
/* rmdir .snap/foo is RMSNAP */
867
dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
868
dentry->d_name.name, dentry);
869
op = CEPH_MDS_OP_RMSNAP;
870
} else if (ceph_snap(dir) == CEPH_NOSNAP) {
871
dout("unlink/rmdir dir %p dn %p inode %p\n",
873
op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ?
874
CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
877
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
882
req->r_dentry = dget(dentry);
884
req->r_locked_dir = dir;
885
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
886
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
887
req->r_inode_drop = drop_caps_for_unlink(inode);
888
err = ceph_mdsc_do_request(mdsc, dir, req);
889
if (!err && !req->r_reply_info.head->is_dentry)
891
ceph_mdsc_put_request(req);
896
static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
897
struct inode *new_dir, struct dentry *new_dentry)
899
struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
900
struct ceph_mds_client *mdsc = fsc->mdsc;
901
struct ceph_mds_request *req;
904
if (ceph_snap(old_dir) != ceph_snap(new_dir))
906
if (ceph_snap(old_dir) != CEPH_NOSNAP ||
907
ceph_snap(new_dir) != CEPH_NOSNAP)
909
dout("rename dir %p dentry %p to dir %p dentry %p\n",
910
old_dir, old_dentry, new_dir, new_dentry);
911
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
914
req->r_dentry = dget(new_dentry);
916
req->r_old_dentry = dget(old_dentry);
917
req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
918
req->r_locked_dir = new_dir;
919
req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
920
req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
921
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
922
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
923
/* release LINK_RDCACHE on source inode (mds will lock it) */
924
req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
925
if (new_dentry->d_inode)
926
req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
927
err = ceph_mdsc_do_request(mdsc, old_dir, req);
928
if (!err && !req->r_reply_info.head->is_dentry) {
930
* Normally d_move() is done by fill_trace (called by
931
* do_request, above). If there is no trace, we need
935
/* d_move screws up d_subdirs order */
936
ceph_dir_clear_complete(new_dir);
938
d_move(old_dentry, new_dentry);
940
/* ensure target dentry is invalidated, despite
941
rehashing bug in vfs_rename_dir */
942
ceph_invalidate_dentry_lease(new_dentry);
944
ceph_mdsc_put_request(req);
949
* Ensure a dentry lease will no longer revalidate.
951
void ceph_invalidate_dentry_lease(struct dentry *dentry)
953
spin_lock(&dentry->d_lock);
954
dentry->d_time = jiffies;
955
ceph_dentry(dentry)->lease_shared_gen = 0;
956
spin_unlock(&dentry->d_lock);
960
* Check if dentry lease is valid. If not, delete the lease. Try to
961
* renew if the least is more than half up.
963
static int dentry_lease_is_valid(struct dentry *dentry)
965
struct ceph_dentry_info *di;
966
struct ceph_mds_session *s;
970
struct ceph_mds_session *session = NULL;
971
struct inode *dir = NULL;
974
spin_lock(&dentry->d_lock);
975
di = ceph_dentry(dentry);
976
if (di && di->lease_session) {
977
s = di->lease_session;
978
spin_lock(&s->s_cap_lock);
981
spin_unlock(&s->s_cap_lock);
983
if (di->lease_gen == gen &&
984
time_before(jiffies, dentry->d_time) &&
985
time_before(jiffies, ttl)) {
987
if (di->lease_renew_after &&
988
time_after(jiffies, di->lease_renew_after)) {
989
/* we should renew */
990
dir = dentry->d_parent->d_inode;
991
session = ceph_get_mds_session(s);
993
di->lease_renew_after = 0;
994
di->lease_renew_from = jiffies;
998
spin_unlock(&dentry->d_lock);
1001
ceph_mdsc_lease_send_msg(session, dir, dentry,
1002
CEPH_MDS_LEASE_RENEW, seq);
1003
ceph_put_mds_session(session);
1005
dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1010
* Check if directory-wide content lease/cap is valid.
1012
static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1014
struct ceph_inode_info *ci = ceph_inode(dir);
1015
struct ceph_dentry_info *di = ceph_dentry(dentry);
1018
spin_lock(&ci->i_ceph_lock);
1019
if (ci->i_shared_gen == di->lease_shared_gen)
1020
valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1021
spin_unlock(&ci->i_ceph_lock);
1022
dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1023
dir, (unsigned)ci->i_shared_gen, dentry,
1024
(unsigned)di->lease_shared_gen, valid);
1029
* Check if cached dentry can be trusted.
1031
static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd)
1036
if (nd && nd->flags & LOOKUP_RCU)
1039
dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
1040
dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
1041
ceph_dentry(dentry)->offset);
1043
dir = ceph_get_dentry_parent_inode(dentry);
1045
/* always trust cached snapped dentries, snapdir dentry */
1046
if (ceph_snap(dir) != CEPH_NOSNAP) {
1047
dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
1048
dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
1050
} else if (dentry->d_inode &&
1051
ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) {
1053
} else if (dentry_lease_is_valid(dentry) ||
1054
dir_lease_is_valid(dir, dentry)) {
1058
dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1060
ceph_dentry_lru_touch(dentry);
1068
* Release our ceph_dentry_info.
1070
static void ceph_d_release(struct dentry *dentry)
1072
struct ceph_dentry_info *di = ceph_dentry(dentry);
1074
dout("d_release %p\n", dentry);
1076
ceph_dentry_lru_del(dentry);
1077
if (di->lease_session)
1078
ceph_put_mds_session(di->lease_session);
1079
kmem_cache_free(ceph_dentry_cachep, di);
1080
dentry->d_fsdata = NULL;
1084
static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1085
struct nameidata *nd)
1088
* Eventually, we'll want to revalidate snapped metadata
1089
* too... probably...
1095
* Set/clear/test dir complete flag on the dir's dentry.
1097
void ceph_dir_set_complete(struct inode *inode)
1099
/* not yet implemented */
1102
void ceph_dir_clear_complete(struct inode *inode)
1104
/* not yet implemented */
1107
bool ceph_dir_test_complete(struct inode *inode)
1109
/* not yet implemented */
1114
* When the VFS prunes a dentry from the cache, we need to clear the
1115
* complete flag on the parent directory.
1117
* Called under dentry->d_lock.
1119
static void ceph_d_prune(struct dentry *dentry)
1121
struct ceph_dentry_info *di;
1123
dout("ceph_d_prune %p\n", dentry);
1125
/* do we have a valid parent? */
1126
if (!dentry->d_parent || IS_ROOT(dentry))
1129
/* if we are not hashed, we don't affect D_COMPLETE */
1130
if (d_unhashed(dentry))
1134
* we hold d_lock, so d_parent is stable, and d_fsdata is never
1135
* cleared until d_release
1137
di = ceph_dentry(dentry->d_parent);
1138
clear_bit(CEPH_D_COMPLETE, &di->flags);
1142
* read() on a dir. This weird interface hack only works if mounted
1143
* with '-o dirstat'.
1145
static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1148
struct ceph_file_info *cf = file->private_data;
1149
struct inode *inode = file->f_dentry->d_inode;
1150
struct ceph_inode_info *ci = ceph_inode(inode);
1152
const int bufsize = 1024;
1154
if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1157
if (!cf->dir_info) {
1158
cf->dir_info = kmalloc(bufsize, GFP_NOFS);
1162
snprintf(cf->dir_info, bufsize,
1165
" subdirs: %20lld\n"
1166
"rentries: %20lld\n"
1168
" rsubdirs: %20lld\n"
1170
"rctime: %10ld.%09ld\n",
1171
ci->i_files + ci->i_subdirs,
1174
ci->i_rfiles + ci->i_rsubdirs,
1178
(long)ci->i_rctime.tv_sec,
1179
(long)ci->i_rctime.tv_nsec);
1182
if (*ppos >= cf->dir_info_len)
1184
size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1185
left = copy_to_user(buf, cf->dir_info + *ppos, size);
1188
*ppos += (size - left);
1193
* an fsync() on a dir will wait for any uncommitted directory
1194
* operations to commit.
1196
static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
1199
struct inode *inode = file->f_path.dentry->d_inode;
1200
struct ceph_inode_info *ci = ceph_inode(inode);
1201
struct list_head *head = &ci->i_unsafe_dirops;
1202
struct ceph_mds_request *req;
1206
dout("dir_fsync %p\n", inode);
1207
ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1210
mutex_lock(&inode->i_mutex);
1212
spin_lock(&ci->i_unsafe_lock);
1213
if (list_empty(head))
1216
req = list_entry(head->prev,
1217
struct ceph_mds_request, r_unsafe_dir_item);
1218
last_tid = req->r_tid;
1221
ceph_mdsc_get_request(req);
1222
spin_unlock(&ci->i_unsafe_lock);
1223
dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1224
inode, req->r_tid, last_tid);
1225
if (req->r_timeout) {
1226
ret = wait_for_completion_timeout(
1227
&req->r_safe_completion, req->r_timeout);
1231
ret = -EIO; /* timed out */
1233
wait_for_completion(&req->r_safe_completion);
1235
spin_lock(&ci->i_unsafe_lock);
1236
ceph_mdsc_put_request(req);
1238
if (ret || list_empty(head))
1240
req = list_entry(head->next,
1241
struct ceph_mds_request, r_unsafe_dir_item);
1242
} while (req->r_tid < last_tid);
1244
spin_unlock(&ci->i_unsafe_lock);
1245
mutex_unlock(&inode->i_mutex);
1251
* We maintain a private dentry LRU.
1253
* FIXME: this needs to be changed to a per-mds lru to be useful.
1255
void ceph_dentry_lru_add(struct dentry *dn)
1257
struct ceph_dentry_info *di = ceph_dentry(dn);
1258
struct ceph_mds_client *mdsc;
1260
dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
1261
dn->d_name.len, dn->d_name.name);
1263
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1264
spin_lock(&mdsc->dentry_lru_lock);
1265
list_add_tail(&di->lru, &mdsc->dentry_lru);
1267
spin_unlock(&mdsc->dentry_lru_lock);
1271
void ceph_dentry_lru_touch(struct dentry *dn)
1273
struct ceph_dentry_info *di = ceph_dentry(dn);
1274
struct ceph_mds_client *mdsc;
1276
dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
1277
dn->d_name.len, dn->d_name.name, di->offset);
1279
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1280
spin_lock(&mdsc->dentry_lru_lock);
1281
list_move_tail(&di->lru, &mdsc->dentry_lru);
1282
spin_unlock(&mdsc->dentry_lru_lock);
1286
void ceph_dentry_lru_del(struct dentry *dn)
1288
struct ceph_dentry_info *di = ceph_dentry(dn);
1289
struct ceph_mds_client *mdsc;
1291
dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
1292
dn->d_name.len, dn->d_name.name);
1294
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1295
spin_lock(&mdsc->dentry_lru_lock);
1296
list_del_init(&di->lru);
1298
spin_unlock(&mdsc->dentry_lru_lock);
1303
* Return name hash for a given dentry. This is dependent on
1304
* the parent directory's hash function.
1306
unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1308
struct ceph_inode_info *dci = ceph_inode(dir);
1310
switch (dci->i_dir_layout.dl_dir_hash) {
1311
case 0: /* for backward compat */
1312
case CEPH_STR_HASH_LINUX:
1313
return dn->d_name.hash;
1316
return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1317
dn->d_name.name, dn->d_name.len);
1321
const struct file_operations ceph_dir_fops = {
1322
.read = ceph_read_dir,
1323
.readdir = ceph_readdir,
1324
.llseek = ceph_dir_llseek,
1326
.release = ceph_release,
1327
.unlocked_ioctl = ceph_ioctl,
1328
.fsync = ceph_dir_fsync,
1331
const struct inode_operations ceph_dir_iops = {
1332
.lookup = ceph_lookup,
1333
.permission = ceph_permission,
1334
.getattr = ceph_getattr,
1335
.setattr = ceph_setattr,
1336
.setxattr = ceph_setxattr,
1337
.getxattr = ceph_getxattr,
1338
.listxattr = ceph_listxattr,
1339
.removexattr = ceph_removexattr,
1340
.mknod = ceph_mknod,
1341
.symlink = ceph_symlink,
1342
.mkdir = ceph_mkdir,
1344
.unlink = ceph_unlink,
1345
.rmdir = ceph_unlink,
1346
.rename = ceph_rename,
1347
.create = ceph_create,
1350
const struct dentry_operations ceph_dentry_ops = {
1351
.d_revalidate = ceph_d_revalidate,
1352
.d_release = ceph_d_release,
1353
.d_prune = ceph_d_prune,
1356
const struct dentry_operations ceph_snapdir_dentry_ops = {
1357
.d_revalidate = ceph_snapdir_d_revalidate,
1358
.d_release = ceph_d_release,
1361
const struct dentry_operations ceph_snap_dentry_ops = {
1362
.d_release = ceph_d_release,
1363
.d_prune = ceph_d_prune,