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udf: Fix loading of special inodes

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Some UDF media have special inodes (like VAT or metadata partition
inodes) whose link_count is 0. Thus commit 4071b91362 (udf: Properly
detect stale inodes) broke loading these inodes because udf_iget()
started returning -ESTALE for them. Since we still need to properly
detect stale inodes queried by NFS, create two variants of udf_iget() -
one which is used for looking up special inodes (which ignores
link_count == 0) and one which is used for other cases which return
ESTALE when link_count == 0.

Fixes: 4071b91362
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2014-10-09 12:52:16 +02:00
parent c53f755d33
commit 6174c2eb8e
3 changed files with 26 additions and 11 deletions
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10
fs/udf/inode.c
View File

@ -1277,7 +1277,7 @@ update_time:
*/
#define UDF_MAX_ICB_NESTING 1024
static int udf_read_inode(struct inode *inode)
static int udf_read_inode(struct inode *inode, bool hidden_inode)
{
struct buffer_head *bh = NULL;
struct fileEntry *fe;
@ -1436,9 +1436,12 @@ reread:
link_count = le16_to_cpu(fe->fileLinkCount);
if (!link_count) {
if (!hidden_inode) {
ret = -ESTALE;
goto out;
}
link_count = 1;
}
set_nlink(inode, link_count);
inode->i_size = le64_to_cpu(fe->informationLength);
@ -1826,7 +1829,8 @@ out:
return err;
}
struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
bool hidden_inode)
{
unsigned long block = udf_get_lb_pblock(sb, ino, 0);
struct inode *inode = iget_locked(sb, block);
@ -1839,7 +1843,7 @@ struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
return inode;
memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
err = udf_read_inode(inode);
err = udf_read_inode(inode, hidden_inode);
if (err < 0) {
iget_failed(inode);
return ERR_PTR(err);

10
fs/udf/super.c
View File

@ -959,7 +959,7 @@ struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
addr.logicalBlockNum = meta_file_loc;
addr.partitionReferenceNum = partition_num;
metadata_fe = udf_iget(sb, &addr);
metadata_fe = udf_iget_special(sb, &addr);
if (IS_ERR(metadata_fe)) {
udf_warn(sb, "metadata inode efe not found\n");
@ -1020,7 +1020,7 @@ static int udf_load_metadata_files(struct super_block *sb, int partition)
udf_debug("Bitmap file location: block = %d part = %d\n",
addr.logicalBlockNum, addr.partitionReferenceNum);
fe = udf_iget(sb, &addr);
fe = udf_iget_special(sb, &addr);
if (IS_ERR(fe)) {
if (sb->s_flags & MS_RDONLY)
udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
@ -1119,7 +1119,7 @@ static int udf_fill_partdesc_info(struct super_block *sb,
};
struct inode *inode;
inode = udf_iget(sb, &loc);
inode = udf_iget_special(sb, &loc);
if (IS_ERR(inode)) {
udf_debug("cannot load unallocSpaceTable (part %d)\n",
p_index);
@ -1154,7 +1154,7 @@ static int udf_fill_partdesc_info(struct super_block *sb,
};
struct inode *inode;
inode = udf_iget(sb, &loc);
inode = udf_iget_special(sb, &loc);
if (IS_ERR(inode)) {
udf_debug("cannot load freedSpaceTable (part %d)\n",
p_index);
@ -1198,7 +1198,7 @@ static void udf_find_vat_block(struct super_block *sb, int p_index,
vat_block >= map->s_partition_root &&
vat_block >= start_block - 3; vat_block--) {
ino.logicalBlockNum = vat_block - map->s_partition_root;
inode = udf_iget(sb, &ino);
inode = udf_iget_special(sb, &ino);
if (!IS_ERR(inode)) {
sbi->s_vat_inode = inode;
break;

13
fs/udf/udfdecl.h
View File

@ -138,7 +138,18 @@ extern int udf_write_fi(struct inode *inode, struct fileIdentDesc *,
/* file.c */
extern long udf_ioctl(struct file *, unsigned int, unsigned long);
/* inode.c */
extern struct inode *udf_iget(struct super_block *, struct kernel_lb_addr *);
extern struct inode *__udf_iget(struct super_block *, struct kernel_lb_addr *,
bool hidden_inode);
static inline struct inode *udf_iget_special(struct super_block *sb,
struct kernel_lb_addr *ino)
{
return __udf_iget(sb, ino, true);
}
static inline struct inode *udf_iget(struct super_block *sb,
struct kernel_lb_addr *ino)
{
return __udf_iget(sb, ino, false);
}
extern int udf_expand_file_adinicb(struct inode *);
extern struct buffer_head *udf_expand_dir_adinicb(struct inode *, int *, int *);
extern struct buffer_head *udf_bread(struct inode *, int, int, int *);