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GFS2: Don't filter out I_FREEING inodes anymore

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This patch basically reverts a very old patch from 2008,
7a9f53b3c1, with the title
"Alternate gfs2_iget to avoid looking up inodes being freed".
The original patch was designed to avoid a deadlock caused by lock
ordering with try_rgrp_unlink. The patch forced the function to not
find inodes that were being removed by VFS. The problem is, that
made it impossible for nodes to delete their own unlinked dinodes
after a certain point in time, because the inode needed was not found
by this filtering process. There is no longer a need for the patch,
since function try_rgrp_unlink no longer locks the inode: All it does
is queue the glock onto the delete work_queue, so there should be no
more deadlock.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2015-03-27 08:25:41 -05:00
parent a4923865ea
commit ff34245d52
4 changed files with 7 additions and 58 deletions
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2
fs/gfs2/export.c
View File

@ -137,7 +137,7 @@ static struct dentry *gfs2_get_dentry(struct super_block *sb,
struct gfs2_sbd *sdp = sb->s_fs_info;
struct inode *inode;
inode = gfs2_ilookup(sb, inum->no_addr, 0);
inode = gfs2_ilookup(sb, inum->no_addr);
if (inode) {
if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
iput(inode);

2
fs/gfs2/glock.c
View File

@ -582,7 +582,7 @@ static void delete_work_func(struct work_struct *work)
/* Note: Unsafe to dereference ip as we don't hold right refs/locks */
if (ip)
inode = gfs2_ilookup(sdp->sd_vfs, no_addr, 1);
inode = gfs2_ilookup(sdp->sd_vfs, no_addr);
else
inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED);
if (inode && !IS_ERR(inode)) {

59
fs/gfs2/inode.c
View File

@ -37,61 +37,9 @@
#include "super.h"
#include "glops.h"
struct gfs2_skip_data {
u64 no_addr;
int skipped;
int non_block;
};
static int iget_test(struct inode *inode, void *opaque)
struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_skip_data *data = opaque;
if (ip->i_no_addr == data->no_addr) {
if (data->non_block &&
inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
data->skipped = 1;
return 0;
}
return 1;
}
return 0;
}
static int iget_set(struct inode *inode, void *opaque)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_skip_data *data = opaque;
if (data->skipped)
return -ENOENT;
inode->i_ino = (unsigned long)(data->no_addr);
ip->i_no_addr = data->no_addr;
return 0;
}
struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
{
unsigned long hash = (unsigned long)no_addr;
struct gfs2_skip_data data;
data.no_addr = no_addr;
data.skipped = 0;
data.non_block = non_block;
return ilookup5(sb, hash, iget_test, &data);
}
static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
int non_block)
{
struct gfs2_skip_data data;
unsigned long hash = (unsigned long)no_addr;
data.no_addr = no_addr;
data.skipped = 0;
data.non_block = non_block;
return iget5_locked(sb, hash, iget_test, iget_set, &data);
return ilookup(sb, (unsigned long)no_addr);
}
/**
@ -145,8 +93,9 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
struct gfs2_glock *io_gl = NULL;
int error;
inode = gfs2_iget(sb, no_addr, non_block);
inode = iget_locked(sb, (unsigned long)no_addr);
ip = GFS2_I(inode);
ip->i_no_addr = no_addr;
if (!inode)
return ERR_PTR(-ENOMEM);

2
fs/gfs2/inode.h
View File

@ -99,7 +99,7 @@ extern struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned type,
extern struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
u64 *no_formal_ino,
unsigned int blktype);
extern struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int nonblock);
extern struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr);
extern int gfs2_inode_refresh(struct gfs2_inode *ip);