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udf: Make udf_read_inode() and udf_iget() return error 

Currently __udf_read_inode() wasn't returning anything and we found out
whether we succeeded reading inode by checking whether inode is bad or
not. udf_iget() returned NULL on failure and inode pointer otherwise.
Make these two functions properly propagate errors up the call stack and
use the return value in callers.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2014-09-04 16:15:51 +02:00
parent c03aa9f6e1
commit 6d3d5e860a
4 changed files with 97 additions and 96 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

101
fs/udf/inode.c
View File

@ -1277,7 +1277,7 @@ update_time:
*/
#define UDF_MAX_ICB_NESTING 1024
static void __udf_read_inode(struct inode *inode)
static int udf_read_inode(struct inode *inode)
{
struct buffer_head *bh = NULL;
struct fileEntry *fe;
@ -1285,10 +1285,19 @@ static void __udf_read_inode(struct inode *inode)
uint16_t ident;
struct udf_inode_info *iinfo = UDF_I(inode);
struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
struct kernel_lb_addr *iloc = &iinfo->i_location;
unsigned int link_count;
unsigned int indirections = 0;
int ret = -EIO;
reread:
if (iloc->logicalBlockNum >=
sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
udf_debug("block=%d, partition=%d out of range\n",
iloc->logicalBlockNum, iloc->partitionReferenceNum);
return -EIO;
}
/*
* Set defaults, but the inode is still incomplete!
* Note: get_new_inode() sets the following on a new inode:
@ -1301,20 +1310,17 @@ reread:
* i_nlink = 1
* i_op = NULL;
*/
bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
if (!bh) {
udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
make_bad_inode(inode);
return;
return -EIO;
}
if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
ident != TAG_IDENT_USE) {
udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
inode->i_ino, ident);
brelse(bh);
make_bad_inode(inode);
return;
goto out;
}
fe = (struct fileEntry *)bh->b_data;
@ -1323,8 +1329,7 @@ reread:
if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
struct buffer_head *ibh;
ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
&ident);
ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
if (ident == TAG_IDENT_IE && ibh) {
struct kernel_lb_addr loc;
struct indirectEntry *ie;
@ -1333,7 +1338,6 @@ reread:
loc = lelb_to_cpu(ie->indirectICB.extLocation);
if (ie->indirectICB.extLength) {
brelse(bh);
brelse(ibh);
memcpy(&iinfo->i_location, &loc,
sizeof(struct kernel_lb_addr));
@ -1342,9 +1346,9 @@ reread:
"too many ICBs in ICB hierarchy"
" (max %d supported)\n",
UDF_MAX_ICB_NESTING);
make_bad_inode(inode);
return;
goto out;
}
brelse(bh);
goto reread;
}
}
@ -1352,9 +1356,7 @@ reread:
} else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
udf_err(inode->i_sb, "unsupported strategy type: %d\n",
le16_to_cpu(fe->icbTag.strategyType));
brelse(bh);
make_bad_inode(inode);
return;
goto out;
}
if (fe->icbTag.strategyType == cpu_to_le16(4))
iinfo->i_strat4096 = 0;
@ -1372,11 +1374,10 @@ reread:
if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
iinfo->i_efe = 1;
iinfo->i_use = 0;
if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
sizeof(struct extendedFileEntry))) {
make_bad_inode(inode);
return;
}
ret = udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
sizeof(struct extendedFileEntry));
if (ret)
goto out;
memcpy(iinfo->i_ext.i_data,
bh->b_data + sizeof(struct extendedFileEntry),
inode->i_sb->s_blocksize -
@ -1384,11 +1385,10 @@ reread:
} else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
iinfo->i_efe = 0;
iinfo->i_use = 0;
if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
sizeof(struct fileEntry))) {
make_bad_inode(inode);
return;
}
ret = udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
sizeof(struct fileEntry));
if (ret)
goto out;
memcpy(iinfo->i_ext.i_data,
bh->b_data + sizeof(struct fileEntry),
inode->i_sb->s_blocksize - sizeof(struct fileEntry));
@ -1398,18 +1398,18 @@ reread:
iinfo->i_lenAlloc = le32_to_cpu(
((struct unallocSpaceEntry *)bh->b_data)->
lengthAllocDescs);
if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
sizeof(struct unallocSpaceEntry))) {
make_bad_inode(inode);
return;
}
ret = udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
sizeof(struct unallocSpaceEntry));
if (ret)
goto out;
memcpy(iinfo->i_ext.i_data,
bh->b_data + sizeof(struct unallocSpaceEntry),
inode->i_sb->s_blocksize -
sizeof(struct unallocSpaceEntry));
return;
return 0;
}
ret = -EIO;
read_lock(&sbi->s_cred_lock);
i_uid_write(inode, le32_to_cpu(fe->uid));
if (!uid_valid(inode->i_uid) ||
@ -1531,8 +1531,7 @@ reread:
default:
udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
inode->i_ino, fe->icbTag.fileType);
make_bad_inode(inode);
return;
goto out;
}
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
struct deviceSpec *dsea =
@ -1543,9 +1542,12 @@ reread:
le32_to_cpu(dsea->minorDeviceIdent)));
/* Developer ID ??? */
} else
make_bad_inode(inode);
goto out;
}
ret = 0;
out:
brelse(bh);
return ret;
}
static int udf_alloc_i_data(struct inode *inode, size_t size)
@ -1825,32 +1827,23 @@ struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
{
unsigned long block = udf_get_lb_pblock(sb, ino, 0);
struct inode *inode = iget_locked(sb, block);
int err;
if (!inode)
return NULL;
return ERR_PTR(-ENOMEM);
if (inode->i_state & I_NEW) {
memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
__udf_read_inode(inode);
unlock_new_inode(inode);
}
if (is_bad_inode(inode))
goto out_iput;
if (ino->logicalBlockNum >= UDF_SB(sb)->
s_partmaps[ino->partitionReferenceNum].s_partition_len) {
udf_debug("block=%d, partition=%d out of range\n",
ino->logicalBlockNum, ino->partitionReferenceNum);
make_bad_inode(inode);
goto out_iput;
if (!(inode->i_state & I_NEW))
return inode;
memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
err = udf_read_inode(inode);
if (err < 0) {
iget_failed(inode);
return ERR_PTR(err);
}
unlock_new_inode(inode);
return inode;
out_iput:
iput(inode);
return NULL;
}
int udf_add_aext(struct inode *inode, struct extent_position *epos,

22
fs/udf/namei.c
View File

@ -270,9 +270,8 @@ static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
NULL, 0),
};
inode = udf_iget(dir->i_sb, lb);
if (!inode) {
return ERR_PTR(-EACCES);
}
if (IS_ERR(inode))
return inode;
} else
#endif /* UDF_RECOVERY */
@ -285,9 +284,8 @@ static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
loc = lelb_to_cpu(cfi.icb.extLocation);
inode = udf_iget(dir->i_sb, &loc);
if (!inode) {
return ERR_PTR(-EACCES);
}
if (IS_ERR(inode))
return ERR_CAST(inode);
}
return d_splice_alias(inode, dentry);
@ -1222,7 +1220,7 @@ static struct dentry *udf_get_parent(struct dentry *child)
struct udf_fileident_bh fibh;
if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
goto out_unlock;
return ERR_PTR(-EACCES);
if (fibh.sbh != fibh.ebh)
brelse(fibh.ebh);
@ -1230,12 +1228,10 @@ static struct dentry *udf_get_parent(struct dentry *child)
tloc = lelb_to_cpu(cfi.icb.extLocation);
inode = udf_iget(child->d_inode->i_sb, &tloc);
if (!inode)
goto out_unlock;
if (IS_ERR(inode))
return ERR_CAST(inode);
return d_obtain_alias(inode);
out_unlock:
return ERR_PTR(-EACCES);
}
@ -1252,8 +1248,8 @@ static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
loc.partitionReferenceNum = partref;
inode = udf_iget(sb, &loc);
if (inode == NULL)
return ERR_PTR(-ENOMEM);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {
iput(inode);

69
fs/udf/super.c
View File

@ -961,12 +961,14 @@ struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
metadata_fe = udf_iget(sb, &addr);
if (metadata_fe == NULL)
if (IS_ERR(metadata_fe)) {
udf_warn(sb, "metadata inode efe not found\n");
else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
return metadata_fe;
}
if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
iput(metadata_fe);
metadata_fe = NULL;
return ERR_PTR(-EIO);
}
return metadata_fe;
@ -978,6 +980,7 @@ static int udf_load_metadata_files(struct super_block *sb, int partition)
struct udf_part_map *map;
struct udf_meta_data *mdata;
struct kernel_lb_addr addr;
struct inode *fe;
map = &sbi->s_partmaps[partition];
mdata = &map->s_type_specific.s_metadata;
@ -986,22 +989,24 @@ static int udf_load_metadata_files(struct super_block *sb, int partition)
udf_debug("Metadata file location: block = %d part = %d\n",
mdata->s_meta_file_loc, map->s_partition_num);
mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
mdata->s_meta_file_loc, map->s_partition_num);
if (mdata->s_metadata_fe == NULL) {
fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
map->s_partition_num);
if (IS_ERR(fe)) {
/* mirror file entry */
udf_debug("Mirror metadata file location: block = %d part = %d\n",
mdata->s_mirror_file_loc, map->s_partition_num);
mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
mdata->s_mirror_file_loc, map->s_partition_num);
fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
map->s_partition_num);
if (mdata->s_mirror_fe == NULL) {
if (IS_ERR(fe)) {
udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
return -EIO;
return PTR_ERR(fe);
}
}
mdata->s_mirror_fe = fe;
} else
mdata->s_metadata_fe = fe;
/*
* bitmap file entry
@ -1015,15 +1020,16 @@ 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);
mdata->s_bitmap_fe = udf_iget(sb, &addr);
if (mdata->s_bitmap_fe == NULL) {
fe = udf_iget(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");
else {
udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
return -EIO;
return PTR_ERR(fe);
}
}
} else
mdata->s_bitmap_fe = fe;
}
udf_debug("udf_load_metadata_files Ok\n");
@ -1111,13 +1117,15 @@ static int udf_fill_partdesc_info(struct super_block *sb,
phd->unallocSpaceTable.extPosition),
.partitionReferenceNum = p_index,
};
struct inode *inode;
map->s_uspace.s_table = udf_iget(sb, &loc);
if (!map->s_uspace.s_table) {
inode = udf_iget(sb, &loc);
if (IS_ERR(inode)) {
udf_debug("cannot load unallocSpaceTable (part %d)\n",
p_index);
return -EIO;
return PTR_ERR(inode);
}
map->s_uspace.s_table = inode;
map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
udf_debug("unallocSpaceTable (part %d) @ %ld\n",
p_index, map->s_uspace.s_table->i_ino);
@ -1144,14 +1152,15 @@ static int udf_fill_partdesc_info(struct super_block *sb,
phd->freedSpaceTable.extPosition),
.partitionReferenceNum = p_index,
};
struct inode *inode;
map->s_fspace.s_table = udf_iget(sb, &loc);
if (!map->s_fspace.s_table) {
inode = udf_iget(sb, &loc);
if (IS_ERR(inode)) {
udf_debug("cannot load freedSpaceTable (part %d)\n",
p_index);
return -EIO;
return PTR_ERR(inode);
}
map->s_fspace.s_table = inode;
map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
udf_debug("freedSpaceTable (part %d) @ %ld\n",
p_index, map->s_fspace.s_table->i_ino);
@ -1178,6 +1187,7 @@ static void udf_find_vat_block(struct super_block *sb, int p_index,
struct udf_part_map *map = &sbi->s_partmaps[p_index];
sector_t vat_block;
struct kernel_lb_addr ino;
struct inode *inode;
/*
* VAT file entry is in the last recorded block. Some broken disks have
@ -1186,10 +1196,13 @@ static void udf_find_vat_block(struct super_block *sb, int p_index,
ino.partitionReferenceNum = type1_index;
for (vat_block = start_block;
vat_block >= map->s_partition_root &&
vat_block >= start_block - 3 &&
!sbi->s_vat_inode; vat_block--) {
vat_block >= start_block - 3; vat_block--) {
ino.logicalBlockNum = vat_block - map->s_partition_root;
sbi->s_vat_inode = udf_iget(sb, &ino);
inode = udf_iget(sb, &ino);
if (!IS_ERR(inode)) {
sbi->s_vat_inode = inode;
break;
}
}
}
@ -2205,10 +2218,10 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
/* assign inodes by physical block number */
/* perhaps it's not extensible enough, but for now ... */
inode = udf_iget(sb, &rootdir);
if (!inode) {
if (IS_ERR(inode)) {
udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
ret = -EIO;
ret = PTR_ERR(inode);
goto error_out;
}

1
fs/udf/udfdecl.h
View File

@ -143,7 +143,6 @@ 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 *);
extern int udf_setsize(struct inode *, loff_t);
extern void udf_read_inode(struct inode *);
extern void udf_evict_inode(struct inode *);
extern int udf_write_inode(struct inode *, struct writeback_control *wbc);
extern long udf_block_map(struct inode *, sector_t);