NTFS: Fix cluster (de)allocators to work when the runlist is NULL and more
importantly to take a locked runlist rather than them locking it which leads to lock reversal. Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
parent
807c453de7
commit
bbf1813fb8
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@ -70,6 +70,9 @@ ToDo/Notes:
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- Add BUG() checks to ntfs_attr_make_non_resident() and ntfs_attr_set()
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- Add BUG() checks to ntfs_attr_make_non_resident() and ntfs_attr_set()
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to ensure that these functions are never called for compressed or
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to ensure that these functions are never called for compressed or
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encrypted attributes.
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encrypted attributes.
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- Fix cluster (de)allocators to work when the runlist is NULL and more
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importantly to take a locked runlist rather than them locking it
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which leads to lock reversal.
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2.1.23 - Implement extension of resident files and make writing safe as well as
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2.1.23 - Implement extension of resident files and make writing safe as well as
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many bug fixes, cleanups, and enhancements...
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many bug fixes, cleanups, and enhancements...
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@ -54,6 +54,8 @@ int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,
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int ret = 0;
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int ret = 0;
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ntfs_debug("Entering.");
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ntfs_debug("Entering.");
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if (!rl)
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return 0;
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for (; rl->length; rl++) {
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for (; rl->length; rl++) {
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int err;
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int err;
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@ -163,17 +165,9 @@ runlist_element *ntfs_cluster_alloc(ntfs_volume *vol, const VCN start_vcn,
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BUG_ON(zone < FIRST_ZONE);
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BUG_ON(zone < FIRST_ZONE);
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BUG_ON(zone > LAST_ZONE);
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BUG_ON(zone > LAST_ZONE);
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/* Return empty runlist if @count == 0 */
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/* Return NULL if @count is zero. */
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// FIXME: Do we want to just return NULL instead? (AIA)
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if (!count)
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if (!count) {
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return NULL;
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rl = ntfs_malloc_nofs(PAGE_SIZE);
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if (!rl)
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return ERR_PTR(-ENOMEM);
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rl[0].vcn = start_vcn;
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rl[0].lcn = LCN_RL_NOT_MAPPED;
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rl[0].length = 0;
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return rl;
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}
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/* Take the lcnbmp lock for writing. */
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/* Take the lcnbmp lock for writing. */
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down_write(&vol->lcnbmp_lock);
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down_write(&vol->lcnbmp_lock);
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/*
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/*
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@ -788,7 +782,8 @@ out:
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* @vi: vfs inode whose runlist describes the clusters to free
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* @vi: vfs inode whose runlist describes the clusters to free
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* @start_vcn: vcn in the runlist of @vi at which to start freeing clusters
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* @start_vcn: vcn in the runlist of @vi at which to start freeing clusters
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* @count: number of clusters to free or -1 for all clusters
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* @count: number of clusters to free or -1 for all clusters
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* @is_rollback: if TRUE this is a rollback operation
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* @write_locked: true if the runlist is locked for writing
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* @is_rollback: true if this is a rollback operation
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*
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*
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* Free @count clusters starting at the cluster @start_vcn in the runlist
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* Free @count clusters starting at the cluster @start_vcn in the runlist
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* described by the vfs inode @vi.
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* described by the vfs inode @vi.
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@ -806,17 +801,17 @@ out:
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* Return the number of deallocated clusters (not counting sparse ones) on
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* Return the number of deallocated clusters (not counting sparse ones) on
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* success and -errno on error.
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* success and -errno on error.
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*
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*
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* Locking: - The runlist described by @vi must be unlocked on entry and is
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* Locking: - The runlist described by @vi must be locked on entry and is
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* unlocked on return.
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* locked on return. Note if the runlist is locked for reading the
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* - This function takes the runlist lock of @vi for reading and
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* lock may be dropped and reacquired. Note the runlist may be
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* sometimes for writing and sometimes modifies the runlist.
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* modified when needed runlist fragments need to be mapped.
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* - The volume lcn bitmap must be unlocked on entry and is unlocked
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* - The volume lcn bitmap must be unlocked on entry and is unlocked
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* on return.
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* on return.
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* - This function takes the volume lcn bitmap lock for writing and
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* - This function takes the volume lcn bitmap lock for writing and
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* modifies the bitmap contents.
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* modifies the bitmap contents.
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*/
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*/
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s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn, s64 count,
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s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn, s64 count,
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const BOOL is_rollback)
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const BOOL write_locked, const BOOL is_rollback)
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{
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{
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s64 delta, to_free, total_freed, real_freed;
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s64 delta, to_free, total_freed, real_freed;
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ntfs_inode *ni;
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ntfs_inode *ni;
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@ -848,8 +843,7 @@ s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn, s64 count,
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total_freed = real_freed = 0;
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total_freed = real_freed = 0;
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down_read(&ni->runlist.lock);
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rl = ntfs_attr_find_vcn_nolock(ni, start_vcn, write_locked);
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rl = ntfs_attr_find_vcn_nolock(ni, start_vcn, FALSE);
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if (IS_ERR(rl)) {
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if (IS_ERR(rl)) {
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if (!is_rollback)
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if (!is_rollback)
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ntfs_error(vol->sb, "Failed to find first runlist "
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ntfs_error(vol->sb, "Failed to find first runlist "
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@ -903,7 +897,7 @@ s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn, s64 count,
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/* Attempt to map runlist. */
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/* Attempt to map runlist. */
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vcn = rl->vcn;
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vcn = rl->vcn;
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rl = ntfs_attr_find_vcn_nolock(ni, vcn, FALSE);
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rl = ntfs_attr_find_vcn_nolock(ni, vcn, write_locked);
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if (IS_ERR(rl)) {
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if (IS_ERR(rl)) {
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err = PTR_ERR(rl);
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err = PTR_ERR(rl);
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if (!is_rollback)
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if (!is_rollback)
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@ -950,7 +944,6 @@ s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn, s64 count,
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/* Update the total done clusters. */
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/* Update the total done clusters. */
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total_freed += to_free;
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total_freed += to_free;
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}
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}
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up_read(&ni->runlist.lock);
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if (likely(!is_rollback))
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if (likely(!is_rollback))
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up_write(&vol->lcnbmp_lock);
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up_write(&vol->lcnbmp_lock);
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@ -960,7 +953,6 @@ s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn, s64 count,
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ntfs_debug("Done.");
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ntfs_debug("Done.");
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return real_freed;
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return real_freed;
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err_out:
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err_out:
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up_read(&ni->runlist.lock);
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if (is_rollback)
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if (is_rollback)
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return err;
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return err;
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/* If no real clusters were freed, no need to rollback. */
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/* If no real clusters were freed, no need to rollback. */
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@ -973,7 +965,8 @@ err_out:
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* If rollback fails, set the volume errors flag, emit an error
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* If rollback fails, set the volume errors flag, emit an error
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* message, and return the error code.
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* message, and return the error code.
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*/
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*/
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delta = __ntfs_cluster_free(vi, start_vcn, total_freed, TRUE);
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delta = __ntfs_cluster_free(vi, start_vcn, total_freed, write_locked,
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TRUE);
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if (delta < 0) {
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if (delta < 0) {
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ntfs_error(vol->sb, "Failed to rollback (error %i). Leaving "
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ntfs_error(vol->sb, "Failed to rollback (error %i). Leaving "
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"inconsistent metadata! Unmount and run "
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"inconsistent metadata! Unmount and run "
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@ -43,13 +43,14 @@ extern runlist_element *ntfs_cluster_alloc(ntfs_volume *vol,
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const NTFS_CLUSTER_ALLOCATION_ZONES zone);
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const NTFS_CLUSTER_ALLOCATION_ZONES zone);
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extern s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
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extern s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
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s64 count, const BOOL is_rollback);
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s64 count, const BOOL write_locked, const BOOL is_rollback);
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/**
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/**
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* ntfs_cluster_free - free clusters on an ntfs volume
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* ntfs_cluster_free - free clusters on an ntfs volume
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* @vi: vfs inode whose runlist describes the clusters to free
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* @vi: vfs inode whose runlist describes the clusters to free
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* @start_vcn: vcn in the runlist of @vi at which to start freeing clusters
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* @start_vcn: vcn in the runlist of @vi at which to start freeing clusters
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* @count: number of clusters to free or -1 for all clusters
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* @count: number of clusters to free or -1 for all clusters
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* @write_locked: true if the runlist is locked for writing
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*
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*
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* Free @count clusters starting at the cluster @start_vcn in the runlist
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* Free @count clusters starting at the cluster @start_vcn in the runlist
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* described by the vfs inode @vi.
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* described by the vfs inode @vi.
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@ -64,19 +65,19 @@ extern s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
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* Return the number of deallocated clusters (not counting sparse ones) on
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* Return the number of deallocated clusters (not counting sparse ones) on
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* success and -errno on error.
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* success and -errno on error.
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*
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*
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* Locking: - The runlist described by @vi must be unlocked on entry and is
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* Locking: - The runlist described by @vi must be locked on entry and is
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* unlocked on return.
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* locked on return. Note if the runlist is locked for reading the
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* - This function takes the runlist lock of @vi for reading and
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* lock may be dropped and reacquired. Note the runlist may be
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* sometimes for writing and sometimes modifies the runlist.
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* modified when needed runlist fragments need to be mapped.
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* - The volume lcn bitmap must be unlocked on entry and is unlocked
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* - The volume lcn bitmap must be unlocked on entry and is unlocked
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* on return.
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* on return.
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* - This function takes the volume lcn bitmap lock for writing and
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* - This function takes the volume lcn bitmap lock for writing and
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* modifies the bitmap contents.
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* modifies the bitmap contents.
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*/
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*/
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static inline s64 ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
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static inline s64 ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
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s64 count)
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s64 count, const BOOL write_locked)
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{
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{
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return __ntfs_cluster_free(vi, start_vcn, count, FALSE);
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return __ntfs_cluster_free(vi, start_vcn, count, write_locked, FALSE);
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}
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}
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extern int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,
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extern int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,
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@ -93,8 +94,10 @@ extern int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,
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*
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*
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* Return 0 on success and -errno on error.
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* Return 0 on success and -errno on error.
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*
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*
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* Locking: This function takes the volume lcn bitmap lock for writing and
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* Locking: - This function takes the volume lcn bitmap lock for writing and
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* modifies the bitmap contents.
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* modifies the bitmap contents.
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* - The caller must have locked the runlist @rl for reading or
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* writing.
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*/
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*/
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static inline int ntfs_cluster_free_from_rl(ntfs_volume *vol,
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static inline int ntfs_cluster_free_from_rl(ntfs_volume *vol,
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const runlist_element *rl)
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const runlist_element *rl)
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@ -1953,7 +1953,7 @@ restore_undo_alloc:
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a = ctx->attr;
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a = ctx->attr;
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a->data.non_resident.highest_vcn = cpu_to_sle64(old_last_vcn - 1);
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a->data.non_resident.highest_vcn = cpu_to_sle64(old_last_vcn - 1);
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undo_alloc:
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undo_alloc:
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if (ntfs_cluster_free(vol->mft_ino, old_last_vcn, -1) < 0) {
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if (ntfs_cluster_free(vol->mft_ino, old_last_vcn, -1, TRUE) < 0) {
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ntfs_error(vol->sb, "Failed to free clusters from mft data "
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ntfs_error(vol->sb, "Failed to free clusters from mft data "
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"attribute.%s", es);
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"attribute.%s", es);
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NVolSetErrors(vol);
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NVolSetErrors(vol);
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