#include <linux/buffer_head.h>
#include <linux/falloc.h>
#include <linux/sched/signal.h>
+#include <linux/fiemap.h>
#include "internal.h"
static int ioctl_fibmap(struct file *filp, int __user *p)
{
struct inode *inode = file_inode(filp);
+ struct super_block *sb = inode->i_sb;
int error, ur_block;
sector_t block;
block = ur_block;
error = bmap(inode, &block);
+ if (block > INT_MAX) {
+ error = -ERANGE;
+ pr_warn_ratelimited("[%s/%d] FS: %s File: %pD4 would truncate fibmap result\n",
+ current->comm, task_pid_nr(current),
+ sb->s_id, filp);
+ }
+
if (error)
ur_block = 0;
else
EXPORT_SYMBOL(fiemap_fill_next_extent);
/**
- * fiemap_check_flags - check validity of requested flags for fiemap
+ * fiemap_prep - check validity of requested flags for fiemap
+ * @inode: Inode to operate on
* @fieinfo: Fiemap context passed into ->fiemap
- * @fs_flags: Set of fiemap flags that the file system understands
+ * @start: Start of the mapped range
+ * @len: Length of the mapped range, can be truncated by this function.
+ * @supported_flags: Set of fiemap flags that the file system understands
*
- * Called from file system ->fiemap callback. This will compute the
- * intersection of valid fiemap flags and those that the fs supports. That
- * value is then compared against the user supplied flags. In case of bad user
- * flags, the invalid values will be written into the fieinfo structure, and
- * -EBADR is returned, which tells ioctl_fiemap() to return those values to
- * userspace. For this reason, a return code of -EBADR should be preserved.
+ * This function must be called from each ->fiemap instance to validate the
+ * fiemap request against the file system parameters.
*
- * Returns 0 on success, -EBADR on bad flags.
+ * Returns 0 on success, or a negative error on failure.
*/
-int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
+int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ u64 start, u64 *len, u32 supported_flags)
{
+ u64 maxbytes = inode->i_sb->s_maxbytes;
u32 incompat_flags;
+ int ret = 0;
- 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;
- return 0;
+ supported_flags |= FIEMAP_FLAG_SYNC;
+ supported_flags &= FIEMAP_FLAGS_COMPAT;
+ incompat_flags = fieinfo->fi_flags & ~supported_flags;
+ if (incompat_flags) {
+ fieinfo->fi_flags = incompat_flags;
+ return -EBADR;
+ }
+
+ if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC)
+ ret = filemap_write_and_wait(inode->i_mapping);
+ return ret;
}
+EXPORT_SYMBOL(fiemap_prep);
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)
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;
- if (fiemap.fm_extent_count != 0 &&
- !access_ok(fieinfo.fi_extents_start,
- fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
- return -EFAULT;
-
- if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
- filemap_write_and_wait(inode->i_mapping);
+ error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start,
+ fiemap.fm_length);
- error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
fiemap.fm_flags = fieinfo.fi_flags;
fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
* If you use this function directly, you need to do your own locking. Use
* generic_block_fiemap if you want the locking done for you.
*/
-
-int __generic_block_fiemap(struct inode *inode,
+static int __generic_block_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo, loff_t start,
loff_t len, get_block_t *get_block)
{
bool past_eof = false, whole_file = false;
int ret = 0;
- ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
+ ret = fiemap_prep(inode, fieinfo, start, &len, FIEMAP_FLAG_SYNC);
if (ret)
return ret;
return ret;
}
-EXPORT_SYMBOL(__generic_block_fiemap);
/**
* generic_block_fiemap - FIEMAP for block based inodes
projects / linux-2.6-microblaze.git / blobdiff