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NTFS: Change ntfs_cluster_free() to require a write locked runlist on entry

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since we otherwise get into a lock reversal deadlock if a read locked
      runlist is passed in. In the process also change it to take an ntfs
      inode instead of a vfs inode as parameter.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov 2005-09-23 11:24:28 +01:00
parent 91fbc6edfa
commit 715dc636b6
5 changed files with 32 additions and 34 deletions
Download patch file Download diff file Expand all files Collapse all files

31
fs/ntfs/lcnalloc.c
View file

@ -779,14 +779,13 @@ out:
/**
* __ntfs_cluster_free - free clusters on an ntfs volume
* @vi: vfs inode whose runlist describes the clusters to free
* @start_vcn: vcn in the runlist of @vi at which to start freeing clusters
* @ni: ntfs inode whose runlist describes the clusters to free
* @start_vcn: vcn in the runlist of @ni at which to start freeing clusters
* @count: number of clusters to free or -1 for all clusters
* @write_locked: true if the runlist is locked for writing
* @is_rollback: true if this is a rollback operation
*
* Free @count clusters starting at the cluster @start_vcn in the runlist
* described by the vfs inode @vi.
* described by the vfs inode @ni.
*
* If @count is -1, all clusters from @start_vcn to the end of the runlist are
* deallocated. Thus, to completely free all clusters in a runlist, use
@ -801,31 +800,28 @@ out:
* Return the number of deallocated clusters (not counting sparse ones) on
* success and -errno on error.
*
* Locking: - The runlist described by @vi must be locked on entry and is
* locked on return. Note if the runlist is locked for reading the
* lock may be dropped and reacquired. Note the runlist may be
* modified when needed runlist fragments need to be mapped.
* Locking: - The runlist described by @ni must be locked for writing on entry
* and is locked on return. Note the runlist may be modified when
* needed runlist fragments need to be mapped.
* - The volume lcn bitmap must be unlocked on entry and is unlocked
* on return.
* - This function takes the volume lcn bitmap lock for writing and
* modifies the bitmap contents.
*/
s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn, s64 count,
const BOOL write_locked, const BOOL is_rollback)
s64 __ntfs_cluster_free(ntfs_inode *ni, const VCN start_vcn, s64 count,
const BOOL is_rollback)
{
s64 delta, to_free, total_freed, real_freed;
ntfs_inode *ni;
ntfs_volume *vol;
struct inode *lcnbmp_vi;
runlist_element *rl;
int err;
BUG_ON(!vi);
BUG_ON(!ni);
ntfs_debug("Entering for i_ino 0x%lx, start_vcn 0x%llx, count "
"0x%llx.%s", vi->i_ino, (unsigned long long)start_vcn,
"0x%llx.%s", ni->mft_no, (unsigned long long)start_vcn,
(unsigned long long)count,
is_rollback ? " (rollback)" : "");
ni = NTFS_I(vi);
vol = ni->vol;
lcnbmp_vi = vol->lcnbmp_ino;
BUG_ON(!lcnbmp_vi);
@ -843,7 +839,7 @@ s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn, s64 count,
total_freed = real_freed = 0;
rl = ntfs_attr_find_vcn_nolock(ni, start_vcn, write_locked);
rl = ntfs_attr_find_vcn_nolock(ni, start_vcn, TRUE);
if (IS_ERR(rl)) {
if (!is_rollback)
ntfs_error(vol->sb, "Failed to find first runlist "
@ -897,7 +893,7 @@ s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn, s64 count,
/* Attempt to map runlist. */
vcn = rl->vcn;
rl = ntfs_attr_find_vcn_nolock(ni, vcn, write_locked);
rl = ntfs_attr_find_vcn_nolock(ni, vcn, TRUE);
if (IS_ERR(rl)) {
err = PTR_ERR(rl);
if (!is_rollback)
@ -965,8 +961,7 @@ err_out:
* If rollback fails, set the volume errors flag, emit an error
* message, and return the error code.
*/
delta = __ntfs_cluster_free(vi, start_vcn, total_freed, write_locked,
TRUE);
delta = __ntfs_cluster_free(ni, start_vcn, total_freed, TRUE);
if (delta < 0) {
ntfs_error(vol->sb, "Failed to rollback (error %i). Leaving "
"inconsistent metadata! Unmount and run "