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ceph: use new D_COMPLETE dentry flag

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We used to use a flag on the directory inode to track whether the dcache
contents for a directory were a complete cached copy.  Switch to a dentry
flag CEPH_D_COMPLETE that is safely updated by ->d_prune().

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2011-11-03 09:23:36 -07:00
parent b58dc4100b
commit c6ffe10015
5 changed files with 68 additions and 23 deletions
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8
fs/ceph/caps.c
View File

@ -487,17 +487,15 @@ static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
ci->i_rdcache_gen++;
/*
* if we are newly issued FILE_SHARED, clear I_COMPLETE; we
* if we are newly issued FILE_SHARED, clear D_COMPLETE; we
* don't know what happened to this directory while we didn't
* have the cap.
*/
if ((issued & CEPH_CAP_FILE_SHARED) &&
(had & CEPH_CAP_FILE_SHARED) == 0) {
ci->i_shared_gen++;
if (S_ISDIR(ci->vfs_inode.i_mode)) {
dout(" marking %p NOT complete\n", &ci->vfs_inode);
ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
}
if (S_ISDIR(ci->vfs_inode.i_mode))
ceph_dir_clear_complete(&ci->vfs_inode);
}
}

59
fs/ceph/dir.c
View File

@ -108,7 +108,7 @@ static unsigned fpos_off(loff_t p)
* 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
* D_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).
*/
@ -199,8 +199,8 @@ more:
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);
if (!ceph_dir_test_complete(dir)) {
dout(" lost D_COMPLETE on %p; falling back to mds\n", dir);
err = -EAGAIN;
goto out;
}
@ -285,7 +285,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
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_dir_test_complete(inode) &&
__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
spin_unlock(&inode->i_lock);
err = __dcache_readdir(filp, dirent, filldir);
@ -351,7 +351,7 @@ more:
if (!req->r_did_prepopulate) {
dout("readdir !did_prepopulate");
fi->dir_release_count--; /* preclude I_COMPLETE */
fi->dir_release_count--; /* preclude D_COMPLETE */
}
/* note next offset and last dentry name */
@ -430,8 +430,7 @@ more:
*/
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; */
ceph_dir_set_complete(inode);
ci->i_max_offset = filp->f_pos;
}
spin_unlock(&inode->i_lock);
@ -614,7 +613,7 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
fsc->mount_options->snapdir_name,
dentry->d_name.len) &&
!is_root_ceph_dentry(dir, dentry) &&
(ci->i_ceph_flags & CEPH_I_COMPLETE) &&
ceph_dir_test_complete(dir) &&
(__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
spin_unlock(&dir->i_lock);
dout(" dir %p complete, -ENOENT\n", dir);
@ -934,7 +933,7 @@ static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
*/
/* d_move screws up d_subdirs order */
ceph_i_clear(new_dir, CEPH_I_COMPLETE);
ceph_dir_clear_complete(new_dir);
d_move(old_dentry, new_dentry);
@ -1092,6 +1091,48 @@ static int ceph_snapdir_d_revalidate(struct dentry *dentry,
return 1;
}
/*
* Set/clear/test dir complete flag on the dir's dentry.
*/
static struct dentry * __d_find_any_alias(struct inode *inode)
{
struct dentry *alias;
if (list_empty(&inode->i_dentry))
return NULL;
alias = list_first_entry(&inode->i_dentry, struct dentry, d_alias);
return alias;
}
void ceph_dir_set_complete(struct inode *inode)
{
struct dentry *dentry = __d_find_any_alias(inode);
if (dentry && ceph_dentry(dentry)) {
dout(" marking %p (%p) complete\n", inode, dentry);
set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
}
}
void ceph_dir_clear_complete(struct inode *inode)
{
struct dentry *dentry = __d_find_any_alias(inode);
if (dentry && ceph_dentry(dentry)) {
dout(" marking %p (%p) NOT complete\n", inode, dentry);
clear_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
}
}
bool ceph_dir_test_complete(struct inode *inode)
{
struct dentry *dentry = __d_find_any_alias(inode);
if (dentry && ceph_dentry(dentry))
return test_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
return false;
}
/*
* When the VFS prunes a dentry from the cache, we need to clear the
* complete flag on the parent directory.

8
fs/ceph/inode.c
View File

@ -771,9 +771,9 @@ no_change:
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) {
!ceph_dir_test_complete(inode)) {
dout(" marking %p complete (empty)\n", inode);
/* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
ceph_dir_set_complete(inode);
ci->i_max_offset = 2;
}
@ -856,7 +856,7 @@ static void ceph_set_dentry_offset(struct dentry *dn)
di = ceph_dentry(dn);
spin_lock(&inode->i_lock);
if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
if (!ceph_dir_test_complete(inode)) {
spin_unlock(&inode->i_lock);
return;
}
@ -1056,7 +1056,7 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
* 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.
* D_COMPLETE.
*/
ceph_set_dentry_offset(req->r_old_dentry);
dout("dn %p gets new offset %lld\n", req->r_old_dentry,

6
fs/ceph/mds_client.c
View File

@ -2002,7 +2002,7 @@ out:
}
/*
* Invalidate dir I_COMPLETE, dentry lease state on an aborted MDS
* Invalidate dir D_COMPLETE, dentry lease state on an aborted MDS
* namespace request.
*/
void ceph_invalidate_dir_request(struct ceph_mds_request *req)
@ -2010,9 +2010,9 @@ void ceph_invalidate_dir_request(struct ceph_mds_request *req)
struct inode *inode = req->r_locked_dir;
struct ceph_inode_info *ci = ceph_inode(inode);
dout("invalidate_dir_request %p (I_COMPLETE, lease(s))\n", inode);
dout("invalidate_dir_request %p (D_COMPLETE, lease(s))\n", inode);
spin_lock(&inode->i_lock);
ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
ceph_dir_clear_complete(inode);
ci->i_release_count++;
spin_unlock(&inode->i_lock);

10
fs/ceph/super.h
View File

@ -264,7 +264,7 @@ struct ceph_inode_info {
struct timespec i_rctime;
u64 i_rbytes, i_rfiles, i_rsubdirs;
u64 i_files, i_subdirs;
u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */
u64 i_max_offset; /* largest readdir offset, set with D_COMPLETE */
struct rb_root i_fragtree;
struct mutex i_fragtree_mutex;
@ -429,7 +429,6 @@ static inline struct inode *ceph_find_inode(struct super_block *sb,
/*
* Ceph inode.
*/
#define CEPH_I_COMPLETE 1 /* we have complete directory cached */
#define CEPH_I_NODELAY 4 /* do not delay cap release */
#define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */
#define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */
@ -486,6 +485,13 @@ static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
return ((loff_t)frag << 32) | (loff_t)off;
}
/*
* set/clear directory D_COMPLETE flag
*/
void ceph_dir_set_complete(struct inode *inode);
void ceph_dir_clear_complete(struct inode *inode);
bool ceph_dir_test_complete(struct inode *inode);
/*
* caps helpers
*/