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Old 03-22-2011, 04:54 PM
Bob Peterson
 
Default gfs2: Combine transaction from gfs2_dir_exhash_dealloc

Hi,

At the end of function gfs2_dir_exhash_dealloc, it was setting the dinode
type to "file" to prevent directory corruption in case of a crash.
It was doing so in its own journal transaction. This patch makes the
change occur when the last call is make to leaf_dealloc, since it needs
to rewrite the directory dinode at that time anyway.

Regards,

Bob Peterson
Red Hat File Systems

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
--
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 10a4bbe..6791e49 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -86,7 +86,7 @@ typedef int (*gfs2_dscan_t)(const struct gfs2_dirent *dent,
const struct qstr *name, void *opaque);

static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
- u64 leaf_no);
+ u64 leaf_no, int last_dealloc);

int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
struct buffer_head **bhp)
@@ -1781,10 +1781,10 @@ static int foreach_leaf(struct gfs2_inode *dip)
struct gfs2_leaf *leaf;
u32 hsize, len;
u32 ht_offset, lp_offset, ht_offset_cur = -1;
- u32 index = 0;
+ u32 index = 0, next_index;
__be64 *lp;
u64 leaf_no;
- int error = 0;
+ int error = 0, last;

hsize = 1 << dip->i_depth;
if (hsize * sizeof(u64) != i_size_read(&dip->i_inode)) {
@@ -1819,13 +1819,13 @@ static int foreach_leaf(struct gfs2_inode *dip)
goto out;
leaf = (struct gfs2_leaf *)bh->b_data;
len = 1 << (dip->i_depth - be16_to_cpu(leaf->lf_depth));
+ next_index = (index & ~(len - 1)) + len;
+ last = ((next_index >= hsize) ? 1 : 0);
brelse(bh);
-
- error = leaf_dealloc(dip, index, len, leaf_no);
+ error = leaf_dealloc(dip, index, len, leaf_no, last);
if (error)
goto out;
-
- index = (index & ~(len - 1)) + len;
+ index = next_index;
} else
index++;
}
@@ -1847,13 +1847,13 @@ out:
* @index: the hash table offset in the directory
* @len: the number of pointers to this leaf
* @leaf_no: the leaf number
- * @data: not used
+ * last_dealloc: 1 if this is the final dealloc for the leaf, else 0
*
* Returns: errno
*/

static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
- u64 leaf_no)
+ u64 leaf_no, int last_dealloc)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_leaf *tmp_leaf;
@@ -1940,6 +1940,10 @@ static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
goto out_end_trans;

gfs2_trans_add_bh(dip->i_gl, dibh, 1);
+ /* On the last dealloc, make this a regular file in case we crash.
+ (We don't want to free these blocks a second time.) */
+ if (last_dealloc)
+ dip->i_inode.i_mode = S_IFREG;
gfs2_dinode_out(dip, dibh->b_data);
brelse(dibh);

@@ -1971,33 +1975,8 @@ out:

int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip)
{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- struct buffer_head *bh;
- int error;
-
/* Dealloc on-disk leaves to FREEMETA state */
- error = foreach_leaf(dip);
- if (error)
- return error;
-
- /* Make this a regular file in case we crash.
- (We don't want to free these blocks a second time.) */
-
- error = gfs2_trans_begin(sdp, RES_DINODE, 0);
- if (error)
- return error;
-
- error = gfs2_meta_inode_buffer(dip, &bh);
- if (!error) {
- gfs2_trans_add_bh(dip->i_gl, bh, 1);
- ((struct gfs2_dinode *)bh->b_data)->di_mode =
- cpu_to_be32(S_IFREG);
- brelse(bh);
- }
-
- gfs2_trans_end(sdp);
-
- return error;
+ return foreach_leaf(dip);
}

/**
 
Old 05-19-2011, 08:46 AM
Steven Whitehouse
 
Default GFS2: Combine transaction from gfs2_dir_exhash_dealloc

From: Bob Peterson <rpeterso@redhat.com>

At the end of function gfs2_dir_exhash_dealloc, it was setting the dinode
type to "file" to prevent directory corruption in case of a crash.
It was doing so in its own journal transaction. This patch makes the
change occur when the last call is make to leaf_dealloc, since it needs
to rewrite the directory dinode at that time anyway.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 0bb5f6b..bd57587 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -86,7 +86,7 @@ typedef int (*gfs2_dscan_t)(const struct gfs2_dirent *dent,
const struct qstr *name, void *opaque);

static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
- u64 leaf_no);
+ u64 leaf_no, int last_dealloc);

int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
struct buffer_head **bhp)
@@ -1781,10 +1781,10 @@ static int foreach_leaf(struct gfs2_inode *dip)
struct gfs2_leaf *leaf;
u32 hsize, len;
u32 ht_offset, lp_offset, ht_offset_cur = -1;
- u32 index = 0;
+ u32 index = 0, next_index;
__be64 *lp;
u64 leaf_no;
- int error = 0;
+ int error = 0, last;

hsize = 1 << dip->i_depth;
if (hsize * sizeof(u64) != i_size_read(&dip->i_inode)) {
@@ -1819,13 +1819,13 @@ static int foreach_leaf(struct gfs2_inode *dip)
goto out;
leaf = (struct gfs2_leaf *)bh->b_data;
len = 1 << (dip->i_depth - be16_to_cpu(leaf->lf_depth));
+ next_index = (index & ~(len - 1)) + len;
+ last = ((next_index >= hsize) ? 1 : 0);
brelse(bh);
-
- error = leaf_dealloc(dip, index, len, leaf_no);
+ error = leaf_dealloc(dip, index, len, leaf_no, last);
if (error)
goto out;
-
- index = (index & ~(len - 1)) + len;
+ index = next_index;
} else
index++;
}
@@ -1847,13 +1847,13 @@ out:
* @index: the hash table offset in the directory
* @len: the number of pointers to this leaf
* @leaf_no: the leaf number
- * @data: not used
+ * last_dealloc: 1 if this is the final dealloc for the leaf, else 0
*
* Returns: errno
*/

static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
- u64 leaf_no)
+ u64 leaf_no, int last_dealloc)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_leaf *tmp_leaf;
@@ -1940,6 +1940,10 @@ static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
goto out_end_trans;

gfs2_trans_add_bh(dip->i_gl, dibh, 1);
+ /* On the last dealloc, make this a regular file in case we crash.
+ (We don't want to free these blocks a second time.) */
+ if (last_dealloc)
+ dip->i_inode.i_mode = S_IFREG;
gfs2_dinode_out(dip, dibh->b_data);
brelse(dibh);

@@ -1971,33 +1975,8 @@ out:

int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip)
{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- struct buffer_head *bh;
- int error;
-
/* Dealloc on-disk leaves to FREEMETA state */
- error = foreach_leaf(dip);
- if (error)
- return error;
-
- /* Make this a regular file in case we crash.
- (We don't want to free these blocks a second time.) */
-
- error = gfs2_trans_begin(sdp, RES_DINODE, 0);
- if (error)
- return error;
-
- error = gfs2_meta_inode_buffer(dip, &bh);
- if (!error) {
- gfs2_trans_add_bh(dip->i_gl, bh, 1);
- ((struct gfs2_dinode *)bh->b_data)->di_mode =
- cpu_to_be32(S_IFREG);
- brelse(bh);
- }
-
- gfs2_trans_end(sdp);
-
- return error;
+ return foreach_leaf(dip);
}

/**
--
1.7.4
 

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