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ocfs2: Wrap inode block reads in a dedicated function.

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The ocfs2 code currently reads inodes off disk with a simple
ocfs2_read_block() call.  Each place that does this has a different set
of sanity checks it performs.  Some check only the signature.  A couple
validate the block number (the block read vs di->i_blkno).  A couple
others check for VALID_FL.  Only one place validates i_fs_generation.  A
couple check nothing.  Even when an error is found, they don't all do
the same thing.

We wrap inode reading into ocfs2_read_inode_block().  This will validate
all the above fields, going readonly if they are invalid (they never
should be).  ocfs2_read_inode_block_full() is provided for the places
that want to pass read_block flags.  Every caller is passing a struct
inode with a valid ip_blkno, so we don't need a separate blkno argument
either.

We will remove the validation checks from the rest of the code in a
later commit, as they are no longer necessary.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker
2008-11-13 14:49:11 -08:00
committed by Mark Fasheh
parent a68979b857
commit b657c95c11
12 changed files with 136 additions and 97 deletions
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fs/ocfs2/dlmglue.c
+4 -8
View File
@@ -2024,7 +2024,7 @@ static int ocfs2_inode_lock_update(struct inode *inode,
} else {
/* Boo, we have to go to disk. */
/* read bh, cast, ocfs2_refresh_inode */
status = ocfs2_read_block(inode, oi->ip_blkno, bh);
status = ocfs2_read_inode_block(inode, bh);
if (status < 0) {
mlog_errno(status);
goto bail_refresh;
@@ -2032,18 +2032,14 @@ static int ocfs2_inode_lock_update(struct inode *inode,
fe = (struct ocfs2_dinode *) (*bh)->b_data;
/* This is a good chance to make sure we're not
* locking an invalid object.
* locking an invalid object. ocfs2_read_inode_block()
* already checked that the inode block is sane.
*
* We bug on a stale inode here because we checked
* above whether it was wiped from disk. The wiping
* node provides a guarantee that we receive that
* message and can mark the inode before dropping any
* locks associated with it. */
if (!OCFS2_IS_VALID_DINODE(fe)) {
OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
status = -EIO;
goto bail_refresh;
}
mlog_bug_on_msg(inode->i_generation !=
le32_to_cpu(fe->i_generation),
"Invalid dinode %llu disk generation: %u "
@@ -2085,7 +2081,7 @@ static int ocfs2_assign_bh(struct inode *inode,
return 0;
}
status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, ret_bh);
status = ocfs2_read_inode_block(inode, ret_bh);
if (status < 0)
mlog_errno(status);