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ceph: use I_COMPLETE inode flag instead of D_COMPLETE flag

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commit c6ffe10015 moved the flag that tracks if the dcache contents
for a directory are complete to dentry. The problem is there are
lots of places that use ceph_dir_{set,clear,test}_complete() while
holding i_ceph_lock. but ceph_dir_{set,clear,test}_complete() may
sleep because they call dput().

This patch basically reverts that commit. For ceph_d_prune(), it's
called with both the dentry to prune and the parent dentry are
locked. So it's safe to access the parent dentry's d_inode and
clear I_COMPLETE flag.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Greg Farnum <greg@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Yan, Zheng
2013-02-18 16:38:14 +08:00
committed by Sage Weil
父節點 964266cce9
當前提交 a8673d61ad
共有 5 個文件被更改，包括 34 次插入 和 95 次删除
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62
fs/ceph/dir.c
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@@ -107,7 +107,7 @@ static unsigned fpos_off(loff_t p)
* falling back to a "normal" sync readdir if any dentries in the dir
* are dropped.
*
* D_COMPLETE tells indicates we have all dentries in the dir. It is
* 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).
*/
@@ -198,8 +198,8 @@ more:
filp->f_pos++;
/* make sure a dentry wasn't dropped while we didn't have parent lock */
if (!ceph_dir_test_complete(dir)) {
dout(" lost D_COMPLETE on %p; falling back to mds\n", dir);
if (!ceph_i_test(dir, CEPH_I_COMPLETE)) {
dout(" lost I_COMPLETE on %p; falling back to mds\n", dir);
err = -EAGAIN;
goto out;
}
@@ -284,7 +284,7 @@ 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 &&
ceph_dir_test_complete(inode) &&
(ci->i_ceph_flags & CEPH_I_COMPLETE) &&
__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
spin_unlock(&ci->i_ceph_lock);
err = __dcache_readdir(filp, dirent, filldir);
@@ -350,7 +350,7 @@ more:
if (!req->r_did_prepopulate) {
dout("readdir !did_prepopulate");
fi->dir_release_count--; /* preclude D_COMPLETE */
fi->dir_release_count--; /* preclude I_COMPLETE */
}
/* note next offset and last dentry name */
@@ -429,7 +429,8 @@ more:
*/
spin_lock(&ci->i_ceph_lock);
if (ci->i_release_count == fi->dir_release_count) {
ceph_dir_set_complete(inode);
dout(" marking %p complete\n", inode);
ci->i_ceph_flags |= CEPH_I_COMPLETE;
ci->i_max_offset = filp->f_pos;
}
spin_unlock(&ci->i_ceph_lock);
@@ -604,7 +605,7 @@ 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) &&
ceph_dir_test_complete(dir) &&
(ci->i_ceph_flags & CEPH_I_COMPLETE) &&
(__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
spin_unlock(&ci->i_ceph_lock);
dout(" dir %p complete, -ENOENT\n", dir);
@@ -908,7 +909,7 @@ static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
*/
/* d_move screws up d_subdirs order */
ceph_dir_clear_complete(new_dir);
ceph_i_clear(new_dir, CEPH_I_COMPLETE);
d_move(old_dentry, new_dentry);
@@ -1064,44 +1065,6 @@ static int ceph_snapdir_d_revalidate(struct dentry *dentry,
return 1;
}
/*
* Set/clear/test dir complete flag on the dir's dentry.
*/
void ceph_dir_set_complete(struct inode *inode)
{
struct dentry *dentry = d_find_any_alias(inode);
if (dentry && ceph_dentry(dentry) &&
ceph_test_mount_opt(ceph_sb_to_client(dentry->d_sb), DCACHE)) {
dout(" marking %p (%p) complete\n", inode, dentry);
set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
}
dput(dentry);
}
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) complete\n", inode, dentry);
set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
}
dput(dentry);
}
bool ceph_dir_test_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);
}
dput(dentry);
return false;
}
/*
* When the VFS prunes a dentry from the cache, we need to clear the
* complete flag on the parent directory.
@@ -1110,15 +1073,13 @@ bool ceph_dir_test_complete(struct inode *inode)
*/
static void ceph_d_prune(struct dentry *dentry)
{
struct ceph_dentry_info *di;
dout("ceph_d_prune %p\n", dentry);
/* do we have a valid parent? */
if (IS_ROOT(dentry))
return;
/* if we are not hashed, we don't affect D_COMPLETE */
/* if we are not hashed, we don't affect I_COMPLETE */
if (d_unhashed(dentry))
return;
@@ -1126,8 +1087,7 @@ static void ceph_d_prune(struct dentry *dentry)
* we hold d_lock, so d_parent is stable, and d_fsdata is never
* cleared until d_release
*/
di = ceph_dentry(dentry->d_parent);
clear_bit(CEPH_D_COMPLETE, &di->flags);
ceph_i_clear(dentry->d_parent->d_inode, CEPH_I_COMPLETE);
}
/*