Re: [PATCH [combined]] Stop the ISOFS filesystem from using read_inode(). Make isofs_read_inode()

From: David Howells
Date: Fri Jan 04 2008 - 08:08:01 EST

David Howells <dhowells@xxxxxxxxxx> wrote:

> return an error code, and make isofs_iget() pass it on. Furthermore
> isofs_iget() no longer ever returns NULL for situations where it used to, so
> all the places that call it must use IS_ERR() to check its return value.

Seems "stg mail" dropped the first line of the text. Here's the complete
patch.

David
---
Stop the ISOFS filesystem from using read_inode(). Make isofs_read_inode()

From: David Howells <dhowells@xxxxxxxxxx>

return an error code, and make isofs_iget() pass it on. Furthermore
isofs_iget() no longer ever returns NULL for situations where it used to, so
all the places that call it must use IS_ERR() to check its return value.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

fs/isofs/export.c | 14 ++++++------
fs/isofs/inode.c | 64 +++++++++++++++++++++++++++++++++++------------------
fs/isofs/namei.c | 4 ++-
fs/isofs/rock.c | 4 ++-
4 files changed, 54 insertions(+), 32 deletions(-)


diff --git a/fs/isofs/export.c b/fs/isofs/export.c
index 29f9753..bb21913 100644
--- a/fs/isofs/export.c
+++ b/fs/isofs/export.c
@@ -26,11 +26,9 @@ isofs_export_iget(struct super_block *sb,
if (block == 0)
return ERR_PTR(-ESTALE);
inode = isofs_iget(sb, block, offset);
- if (inode == NULL)
- return ERR_PTR(-ENOMEM);
- if (is_bad_inode(inode)
- || (generation && inode->i_generation != generation))
- {
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ if (generation && inode->i_generation != generation) {
iput(inode);
return ERR_PTR(-ESTALE);
}
@@ -110,8 +108,10 @@ static struct dentry *isofs_export_get_parent(struct dentry *child)
parent_inode = isofs_iget(child_inode->i_sb,
parent_block,
parent_offset);
- if (parent_inode == NULL) {
- rv = ERR_PTR(-EACCES);
+ if (IS_ERR(parent_inode)) {
+ rv = ERR_CAST(parent_inode);
+ if (rv != ERR_PTR(-ENOMEM))
+ rv = ERR_PTR(-EACCES);
goto out;
}

diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 09e3d30..0f5ed8c 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -54,7 +54,7 @@ static void isofs_put_super(struct super_block *sb)
return;
}

-static void isofs_read_inode(struct inode *);
+static int isofs_read_inode(struct inode *);
static int isofs_statfs (struct dentry *, struct kstatfs *);

static struct kmem_cache *isofs_inode_cachep;
@@ -107,7 +107,6 @@ static int isofs_remount(struct super_block *sb, int *flags, char *data)
static const struct super_operations isofs_sops = {
.alloc_inode = isofs_alloc_inode,
.destroy_inode = isofs_destroy_inode,
- .read_inode = isofs_read_inode,
.put_super = isofs_put_super,
.statfs = isofs_statfs,
.remount_fs = isofs_remount,
@@ -552,7 +551,7 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
int joliet_level = 0;
int iso_blknum, block;
int orig_zonesize;
- int table;
+ int table, error = -EINVAL;
unsigned int vol_desc_start;

sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
@@ -810,6 +809,8 @@ root_found:
* we then decide whether to use the Joliet descriptor.
*/
inode = isofs_iget(s, sbi->s_firstdatazone, 0);
+ if (IS_ERR(inode))
+ goto out_no_root;

/*
* If this disk has both Rock Ridge and Joliet on it, then we
@@ -829,6 +830,8 @@ root_found:
"ISOFS: changing to secondary root\n");
iput(inode);
inode = isofs_iget(s, sbi->s_firstdatazone, 0);
+ if (IS_ERR(inode))
+ goto out_no_root;
}
}

@@ -842,8 +845,6 @@ root_found:
sbi->s_joliet_level = joliet_level;

/* check the root inode */
- if (!inode)
- goto out_no_root;
if (!inode->i_op)
goto out_bad_root;

@@ -876,11 +877,14 @@ root_found:
*/
out_bad_root:
printk(KERN_WARNING "%s: root inode not initialized\n", __func__);
- goto out_iput;
-out_no_root:
- printk(KERN_WARNING "%s: get root inode failed\n", __func__);
out_iput:
iput(inode);
+ goto out_no_inode;
+out_no_root:
+ error = PTR_ERR(inode);
+ if (error != -ENOMEM)
+ printk(KERN_WARNING "%s: get root inode failed\n", __func__);
+out_no_inode:
#ifdef CONFIG_JOLIET
if (sbi->s_nls_iocharset)
unload_nls(sbi->s_nls_iocharset);
@@ -908,7 +912,7 @@ out_freesbi:
kfree(opt.iocharset);
kfree(sbi);
s->s_fs_info = NULL;
- return -EINVAL;
+ return error;
}

static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
@@ -930,7 +934,7 @@ static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
/*
* Get a set of blocks; filling in buffer_heads if already allocated
* or getblk() if they are not. Returns the number of blocks inserted
- * (0 == error.)
+ * (-ve == error.)
*/
int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
struct buffer_head **bh, unsigned long nblocks)
@@ -940,11 +944,12 @@ int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
unsigned int firstext;
unsigned long nextblk, nextoff;
long iblock = (long)iblock_s;
- int section, rv;
+ int section, rv, error;
struct iso_inode_info *ei = ISOFS_I(inode);

lock_kernel();

+ error = -EIO;
rv = 0;
if (iblock < 0 || iblock != iblock_s) {
printk(KERN_DEBUG "%s: block number too large\n", __func__);
@@ -983,8 +988,10 @@ int isofs_get_blocks(struct inode *inode, sector_t iblock_s,

offset += sect_size;
ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
- if (!ninode)
+ if (IS_ERR(ninode)) {
+ error = PTR_ERR(ninode);
goto abort;
+ }
firstext = ISOFS_I(ninode)->i_first_extent;
sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
nextblk = ISOFS_I(ninode)->i_next_section_block;
@@ -1017,7 +1024,7 @@ int isofs_get_blocks(struct inode *inode, sector_t iblock_s,

abort:
unlock_kernel();
- return rv;
+ return rv != 0 ? rv : error;
}

/*
@@ -1031,7 +1038,7 @@ static int isofs_get_block(struct inode *inode, sector_t iblock,
return -EROFS;
}

- return isofs_get_blocks(inode, iblock, &bh_result, 1) ? 0 : -EIO;
+ return isofs_get_blocks(inode, iblock, &bh_result, 1);
}

static int isofs_bmap(struct inode *inode, sector_t block)
@@ -1186,7 +1193,7 @@ out_toomany:
goto out;
}

-static void isofs_read_inode(struct inode *inode)
+static int isofs_read_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct isofs_sb_info *sbi = ISOFS_SB(sb);
@@ -1199,6 +1206,7 @@ static void isofs_read_inode(struct inode *inode)
unsigned int de_len;
unsigned long offset;
struct iso_inode_info *ei = ISOFS_I(inode);
+ int ret = -EIO;

block = ei->i_iget5_block;
bh = sb_bread(inode->i_sb, block);
@@ -1216,6 +1224,7 @@ static void isofs_read_inode(struct inode *inode)
tmpde = kmalloc(de_len, GFP_KERNEL);
if (tmpde == NULL) {
printk(KERN_INFO "%s: out of memory\n", __func__);
+ ret = -ENOMEM;
goto fail;
}
memcpy(tmpde, bh->b_data + offset, frag1);
@@ -1259,8 +1268,10 @@ static void isofs_read_inode(struct inode *inode)

ei->i_section_size = isonum_733(de->size);
if (de->flags[-high_sierra] & 0x80) {
- if(isofs_read_level3_size(inode))
+ ret = isofs_read_level3_size(inode);
+ if (ret < 0)
goto fail;
+ ret = -EIO;
} else {
ei->i_next_section_block = 0;
ei->i_next_section_offset = 0;
@@ -1346,16 +1357,16 @@ static void isofs_read_inode(struct inode *inode)
/* XXX - parse_rock_ridge_inode() had already set i_rdev. */
init_special_inode(inode, inode->i_mode, inode->i_rdev);

+ ret = 0;
out:
kfree(tmpde);
if (bh)
brelse(bh);
- return;
+ return ret;

out_badread:
printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
fail:
- make_bad_inode(inode);
goto out;
}

@@ -1394,9 +1405,10 @@ struct inode *isofs_iget(struct super_block *sb,
unsigned long hashval;
struct inode *inode;
struct isofs_iget5_callback_data data;
+ long ret;

if (offset >= 1ul << sb->s_blocksize_bits)
- return NULL;
+ return ERR_PTR(-EINVAL);

data.block = block;
data.offset = offset;
@@ -1406,9 +1418,17 @@ struct inode *isofs_iget(struct super_block *sb,
inode = iget5_locked(sb, hashval, &isofs_iget5_test,
&isofs_iget5_set, &data);

- if (inode && (inode->i_state & I_NEW)) {
- sb->s_op->read_inode(inode);
- unlock_new_inode(inode);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ if (inode->i_state & I_NEW) {
+ ret = isofs_read_inode(inode);
+ if (ret < 0) {
+ iget_failed(inode);
+ inode = ERR_PTR(ret);
+ } else {
+ unlock_new_inode(inode);
+ }
}

return inode;
diff --git a/fs/isofs/namei.c b/fs/isofs/namei.c
index e2b4dad..344b247 100644
--- a/fs/isofs/namei.c
+++ b/fs/isofs/namei.c
@@ -179,9 +179,9 @@ struct dentry *isofs_lookup(struct inode *dir, struct dentry *dentry, struct nam
inode = NULL;
if (found) {
inode = isofs_iget(dir->i_sb, block, offset);
- if (!inode) {
+ if (IS_ERR(inode)) {
unlock_kernel();
- return ERR_PTR(-EACCES);
+ return ERR_CAST(inode);
}
}
unlock_kernel();
diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index f3a1db3..6bd48f0 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -474,8 +474,10 @@ repeat:
isofs_iget(inode->i_sb,
ISOFS_I(inode)->i_first_extent,
0);
- if (!reloc)
+ if (IS_ERR(reloc)) {
+ ret = PTR_ERR(reloc);
goto out;
+ }
inode->i_mode = reloc->i_mode;
inode->i_nlink = reloc->i_nlink;
inode->i_uid = reloc->i_uid;
--
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