Track negative entries v3

Track negative dentries by recording the generation number of the parent
directory in d_fsdata. The generation number for the parent directory is
recorded in the inode_info, which increments every time the lock on the
directory is dropped.

If the generation number of the parent directory and the negative dentry
matches, there is no need to perform the revalidate, else a revalidate
is forced. This improves performance in situations where nodes look for
the same non-existent file multiple times.

Thanks Mark for explaining the DLM sequence.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.de>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Goldwyn Rodrigues 2010-06-28 10:04:32 -05:00 committed by Joel Becker
parent b4d693fcc5
commit 5e98d49240
6 changed files with 42 additions and 5 deletions

View file

@ -40,6 +40,14 @@
#include "inode.h"
#include "super.h"
void ocfs2_dentry_attach_gen(struct dentry *dentry)
{
unsigned long gen =
OCFS2_I(dentry->d_parent->d_inode)->ip_dir_lock_gen;
BUG_ON(dentry->d_inode);
dentry->d_fsdata = (void *)gen;
}
static int ocfs2_dentry_revalidate(struct dentry *dentry,
struct nameidata *nd)
@ -51,11 +59,20 @@ static int ocfs2_dentry_revalidate(struct dentry *dentry,
mlog_entry("(0x%p, '%.*s')\n", dentry,
dentry->d_name.len, dentry->d_name.name);
/* Never trust a negative dentry - force a new lookup. */
/* For a negative dentry -
* check the generation number of the parent and compare with the
* one stored in the inode.
*/
if (inode == NULL) {
mlog(0, "negative dentry: %.*s\n", dentry->d_name.len,
dentry->d_name.name);
goto bail;
unsigned long gen = (unsigned long) dentry->d_fsdata;
unsigned long pgen =
OCFS2_I(dentry->d_parent->d_inode)->ip_dir_lock_gen;
mlog(0, "negative dentry: %.*s parent gen: %lu "
"dentry gen: %lu\n",
dentry->d_name.len, dentry->d_name.name, pgen, gen);
if (gen != pgen)
goto bail;
goto valid;
}
BUG_ON(!osb);
@ -96,6 +113,7 @@ static int ocfs2_dentry_revalidate(struct dentry *dentry,
goto bail;
}
valid:
ret = 1;
bail:
@ -227,6 +245,12 @@ int ocfs2_dentry_attach_lock(struct dentry *dentry,
if (!inode)
return 0;
if (!dentry->d_inode && dentry->d_fsdata) {
/* Converting a negative dentry to positive
Clear dentry->d_fsdata */
dentry->d_fsdata = dl = NULL;
}
if (dl) {
mlog_bug_on_msg(dl->dl_parent_blkno != parent_blkno,
" \"%.*s\": old parent: %llu, new: %llu\n",
@ -452,6 +476,7 @@ static void ocfs2_dentry_iput(struct dentry *dentry, struct inode *inode)
out:
iput(inode);
ocfs2_dentry_attach_gen(dentry);
}
/*

View file

@ -64,5 +64,6 @@ void ocfs2_dentry_move(struct dentry *dentry, struct dentry *target,
struct inode *old_dir, struct inode *new_dir);
extern spinlock_t dentry_attach_lock;
void ocfs2_dentry_attach_gen(struct dentry *dentry);
#endif /* OCFS2_DCACHE_H */

View file

@ -3635,10 +3635,18 @@ static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
{
struct inode *inode;
struct address_space *mapping;
struct ocfs2_inode_info *oi;
inode = ocfs2_lock_res_inode(lockres);
mapping = inode->i_mapping;
if (S_ISDIR(inode->i_mode)) {
oi = OCFS2_I(inode);
oi->ip_dir_lock_gen++;
mlog(0, "generation: %u\n", oi->ip_dir_lock_gen);
goto out;
}
if (!S_ISREG(inode->i_mode))
goto out;

View file

@ -335,6 +335,7 @@ void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
else
inode->i_fop = &ocfs2_dops_no_plocks;
i_size_write(inode, le64_to_cpu(fe->i_size));
OCFS2_I(inode)->ip_dir_lock_gen = 1;
break;
case S_IFLNK:
if (ocfs2_inode_is_fast_symlink(inode))

View file

@ -67,6 +67,7 @@ struct ocfs2_inode_info
/* Only valid if the inode is the dir. */
u32 ip_last_used_slot;
u64 ip_last_used_group;
u32 ip_dir_lock_gen;
struct ocfs2_alloc_reservation ip_la_data_resv;
};

View file

@ -171,7 +171,8 @@ static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
ret = ERR_PTR(status);
goto bail_unlock;
}
}
} else
ocfs2_dentry_attach_gen(dentry);
bail_unlock:
/* Don't drop the cluster lock until *after* the d_add --