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authorCarlos Maiolino <cmaiolino@redhat.com>2020-01-09 14:30:41 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2020-02-03 08:05:37 -0500
commit30460e1ea3e62f8457e087db9a309ed1031630da (patch)
tree5397a83545672205eda15c343eaa20b1427920d4 /fs/jbd2
parentc79f46a282390e0f5b306007bf7b11a46d529538 (diff)
downloadlinux-30460e1ea3e62f8457e087db9a309ed1031630da.tar.bz2
fs: Enable bmap() function to properly return errors
By now, bmap() will either return the physical block number related to the requested file offset or 0 in case of error or the requested offset maps into a hole. This patch makes the needed changes to enable bmap() to proper return errors, using the return value as an error return, and now, a pointer must be passed to bmap() to be filled with the mapped physical block. It will change the behavior of bmap() on return: - negative value in case of error - zero on success or map fell into a hole In case of a hole, the *block will be zero too Since this is a prep patch, by now, the only error return is -EINVAL if ->bmap doesn't exist. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/journal.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 5e408ee24a1a..01fa5d247e39 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -795,18 +795,23 @@ int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr,
{
int err = 0;
unsigned long long ret;
+ sector_t block = 0;
if (journal->j_inode) {
- ret = bmap(journal->j_inode, blocknr);
- if (ret)
- *retp = ret;
- else {
+ block = blocknr;
+ ret = bmap(journal->j_inode, &block);
+
+ if (ret || !block) {
printk(KERN_ALERT "%s: journal block not found "
"at offset %lu on %s\n",
__func__, blocknr, journal->j_devname);
err = -EIO;
__journal_abort_soft(journal, err);
+
+ } else {
+ *retp = block;
}
+
} else {
*retp = blocknr; /* +journal->j_blk_offset */
}
@@ -1244,11 +1249,14 @@ journal_t *jbd2_journal_init_dev(struct block_device *bdev,
journal_t *jbd2_journal_init_inode(struct inode *inode)
{
journal_t *journal;
+ sector_t blocknr;
char *p;
- unsigned long long blocknr;
+ int err = 0;
+
+ blocknr = 0;
+ err = bmap(inode, &blocknr);
- blocknr = bmap(inode, 0);
- if (!blocknr) {
+ if (err || !blocknr) {
pr_err("%s: Cannot locate journal superblock\n",
__func__);
return NULL;