@@ -203,15 +203,13 @@ EINTR once fatal signal received.
Flag checking should be done at the beginning of the ->fiemap callback via the
-fiemap_check_flags() helper:
-
-int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
+fiemap_validate() helper.
The struct fieinfo should be passed in as received from ioctl_fiemap(). The
set of fiemap flags which the fs understands should be passed via fs_flags. If
-fiemap_check_flags finds invalid user flags, it will place the bad values in
+fiemap_validate finds invalid user flags, it will place the bad values in
fieinfo->fi_flags and return -EBADR. If the file system gets -EBADR, from
-fiemap_check_flags(), it should immediately exit, returning that error back to
+fiemap_validate(), it should immediately exit, returning that error back to
ioctl_fiemap().
@@ -8250,7 +8250,7 @@ static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
{
int ret;
- ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS);
+ ret = fiemap_validate(inode, fieinfo, start, &len, BTRFS_FIEMAP_FLAGS);
if (ret)
return ret;
@@ -3408,7 +3408,8 @@ static int smb3_fiemap(struct cifs_tcon *tcon,
int i, num, rc, flags, last_blob;
u64 next;
- if (fiemap_check_flags(fei, FIEMAP_FLAG_SYNC))
+ if (fiemap_validate(cfile->dentry->d_inode, fei, start, &len,
+ FIEMAP_FLAG_SYNC))
return -EBADR;
xid = get_xid();
@@ -4908,8 +4908,9 @@ int ext4_get_es_cache(struct inode *inode, struct fiemap_extent_info *fieinfo,
fieinfo->fi_flags &= ~FIEMAP_FLAG_CACHE;
}
- if (fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC))
- return -EBADR;
+ error = fiemap_validate(inode, fieinfo, start, &len, FIEMAP_FLAG_SYNC);
+ if (error)
+ return error;
error = ext4_fiemap_check_ranges(inode, start, &len);
if (error)
@@ -1825,7 +1825,8 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
return ret;
}
- ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR);
+ ret = fiemap_validate(inode, fieinfo, start, &len,
+ FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR);
if (ret)
return ret;
@@ -141,8 +141,11 @@ int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
EXPORT_SYMBOL(fiemap_fill_next_extent);
/**
- * fiemap_check_flags - check validity of requested flags for fiemap
+ * fiemap_validate - check validity of requested flags for fiemap
+ * @inode: Inode to operate on
* @fieinfo: Fiemap context passed into ->fiemap
+ * @start: Start of the mapped range
+ * @len: Length of the mapped range, can be truncated by this function.
* @fs_flags: Set of fiemap flags that the file system understands
*
* Called from file system ->fiemap callback. This will compute the
@@ -154,48 +157,38 @@ EXPORT_SYMBOL(fiemap_fill_next_extent);
*
* Returns 0 on success, -EBADR on bad flags.
*/
-int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
+int fiemap_validate(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ u64 start, u64 *len, u32 fs_flags)
{
+ u64 maxbytes = inode->i_sb->s_maxbytes;
u32 incompat_flags;
- incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
- if (incompat_flags) {
- fieinfo->fi_flags = incompat_flags;
- return -EBADR;
- }
- return 0;
-}
-EXPORT_SYMBOL(fiemap_check_flags);
-
-static int fiemap_check_ranges(struct super_block *sb,
- u64 start, u64 len, u64 *new_len)
-{
- u64 maxbytes = (u64) sb->s_maxbytes;
-
- *new_len = len;
-
- if (len == 0)
+ if (*len == 0)
return -EINVAL;
-
if (start > maxbytes)
return -EFBIG;
/*
* Shrink request scope to what the fs can actually handle.
*/
- if (len > maxbytes || (maxbytes - len) < start)
- *new_len = maxbytes - start;
+ if (*len > maxbytes || (maxbytes - *len) < start)
+ *len = maxbytes - start;
+
+ incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
+ if (incompat_flags) {
+ fieinfo->fi_flags = incompat_flags;
+ return -EBADR;
+ }
return 0;
}
+EXPORT_SYMBOL(fiemap_validate);
static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap)
{
struct fiemap fiemap;
struct fiemap_extent_info fieinfo = { 0, };
struct inode *inode = file_inode(filp);
- struct super_block *sb = inode->i_sb;
- u64 len;
int error;
if (!inode->i_op->fiemap)
@@ -207,11 +200,6 @@ static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap)
if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
return -EINVAL;
- error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
- &len);
- if (error)
- return error;
-
fieinfo.fi_flags = fiemap.fm_flags;
fieinfo.fi_extents_max = fiemap.fm_extent_count;
fieinfo.fi_extents_start = ufiemap->fm_extents;
@@ -224,7 +212,8 @@ static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap)
if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
filemap_write_and_wait(inode->i_mapping);
- error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
+ error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start,
+ fiemap.fm_length);
fiemap.fm_flags = fieinfo.fi_flags;
fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
@@ -312,7 +301,7 @@ static int __generic_block_fiemap(struct inode *inode,
bool past_eof = false, whole_file = false;
int ret = 0;
- ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
+ ret = fiemap_validate(inode, fieinfo, start, &len, FIEMAP_FLAG_SYNC);
if (ret)
return ret;
@@ -75,7 +75,7 @@ int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
ctx.fi = fi;
ctx.prev.type = IOMAP_HOLE;
- ret = fiemap_check_flags(fi, FIEMAP_FLAG_SYNC);
+ ret = fiemap_validate(inode, fi, start, &len, FIEMAP_FLAG_SYNC);
if (ret)
return ret;
@@ -1006,7 +1006,7 @@ int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
unsigned int blkbits = inode->i_blkbits;
int ret, n;
- ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
+ ret = fiemap_validate(inode, fieinfo, start, &len, FIEMAP_FLAG_SYNC);
if (ret)
return ret;
@@ -746,7 +746,8 @@ int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
struct buffer_head *di_bh = NULL;
struct ocfs2_extent_rec rec;
- ret = fiemap_check_flags(fieinfo, OCFS2_FIEMAP_FLAGS);
+ ret = fiemap_validate(inode, fieinfo, map_start, &map_len,
+ OCFS2_FIEMAP_FLAGS);
if (ret)
return ret;
@@ -13,9 +13,10 @@ struct fiemap_extent_info {
fiemap_extent array */
};
+int fiemap_validate(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ u64 start, u64 *len, u32 fs_flags);
int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
u64 phys, u64 len, u32 flags);
-int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
int generic_block_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo, u64 start, u64 len,
Replace fiemap_check_flags with a fiemap_validate helpers that also takes the inode and mapped range, and performs the sanity check and truncation previously done in fiemap_check_range. This way the validation is inside the file system itself and thus properly works for the stacked overlayfs case as well. Signed-off-by: Christoph Hellwig <hch@lst.de> --- Documentation/filesystems/fiemap.txt | 8 ++--- fs/btrfs/inode.c | 2 +- fs/cifs/smb2ops.c | 3 +- fs/ext4/extents.c | 5 +-- fs/f2fs/data.c | 3 +- fs/ioctl.c | 51 +++++++++++----------------- fs/iomap/fiemap.c | 2 +- fs/nilfs2/inode.c | 2 +- fs/ocfs2/extent_map.c | 3 +- include/linux/fiemap.h | 3 +- 10 files changed, 37 insertions(+), 45 deletions(-)