/*
* lcnalloc.c - Cluster (de)allocation code. Part of the Linux-NTFS project.
*
- * Copyright (c) 2004 Anton Altaparmakov
+ * Copyright (c) 2004-2005 Anton Altaparmakov
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
int ret = 0;
ntfs_debug("Entering.");
+ if (!rl)
+ return 0;
for (; rl->length; rl++) {
int err;
if (rl->lcn < 0)
continue;
err = ntfs_bitmap_clear_run(lcnbmp_vi, rl->lcn, rl->length);
- if (unlikely(err && (!ret || ret == ENOMEM) && ret != err))
+ if (unlikely(err && (!ret || ret == -ENOMEM) && ret != err))
ret = err;
}
ntfs_debug("Done.");
* @count: number of clusters to allocate
* @start_lcn: starting lcn at which to allocate the clusters (or -1 if none)
* @zone: zone from which to allocate the clusters
+ * @is_extension: if TRUE, this is an attribute extension
*
* Allocate @count clusters preferably starting at cluster @start_lcn or at the
* current allocator position if @start_lcn is -1, on the mounted ntfs volume
* @start_vcn specifies the vcn of the first allocated cluster. This makes
* merging the resulting runlist with the old runlist easier.
*
+ * If @is_extension is TRUE, the caller is allocating clusters to extend an
+ * attribute and if it is FALSE, the caller is allocating clusters to fill a
+ * hole in an attribute. Practically the difference is that if @is_extension
+ * is TRUE the returned runlist will be terminated with LCN_ENOENT and if
+ * @is_extension is FALSE the runlist will be terminated with
+ * LCN_RL_NOT_MAPPED.
+ *
* You need to check the return value with IS_ERR(). If this is false, the
* function was successful and the return value is a runlist describing the
* allocated cluster(s). If IS_ERR() is true, the function failed and
*/
runlist_element *ntfs_cluster_alloc(ntfs_volume *vol, const VCN start_vcn,
const s64 count, const LCN start_lcn,
- const NTFS_CLUSTER_ALLOCATION_ZONES zone)
+ const NTFS_CLUSTER_ALLOCATION_ZONES zone,
+ const BOOL is_extension)
{
LCN zone_start, zone_end, bmp_pos, bmp_initial_pos, last_read_pos, lcn;
LCN prev_lcn = 0, prev_run_len = 0, mft_zone_size;
s64 clusters;
+ loff_t i_size;
struct inode *lcnbmp_vi;
runlist_element *rl = NULL;
struct address_space *mapping;
BUG_ON(zone < FIRST_ZONE);
BUG_ON(zone > LAST_ZONE);
- /* Return empty runlist if @count == 0 */
- // FIXME: Do we want to just return NULL instead? (AIA)
- if (!count) {
- rl = ntfs_malloc_nofs(PAGE_SIZE);
- if (!rl)
- return ERR_PTR(-ENOMEM);
- rl[0].vcn = start_vcn;
- rl[0].lcn = LCN_RL_NOT_MAPPED;
- rl[0].length = 0;
- return rl;
- }
+ /* Return NULL if @count is zero. */
+ if (!count)
+ return NULL;
/* Take the lcnbmp lock for writing. */
down_write(&vol->lcnbmp_lock);
/*
clusters = count;
rlpos = rlsize = 0;
mapping = lcnbmp_vi->i_mapping;
+ i_size = i_size_read(lcnbmp_vi);
while (1) {
ntfs_debug("Start of outer while loop: done_zones 0x%x, "
"search_zone %i, pass %i, zone_start 0x%llx, "
last_read_pos = bmp_pos >> 3;
ntfs_debug("last_read_pos 0x%llx.",
(unsigned long long)last_read_pos);
- if (last_read_pos > lcnbmp_vi->i_size) {
+ if (last_read_pos > i_size) {
ntfs_debug("End of attribute reached. "
"Skipping to zone_pass_done.");
goto zone_pass_done;
buf_size = last_read_pos & ~PAGE_CACHE_MASK;
buf = page_address(page) + buf_size;
buf_size = PAGE_CACHE_SIZE - buf_size;
- if (unlikely(last_read_pos + buf_size > lcnbmp_vi->i_size))
- buf_size = lcnbmp_vi->i_size - last_read_pos;
+ if (unlikely(last_read_pos + buf_size > i_size))
+ buf_size = i_size - last_read_pos;
buf_size <<= 3;
lcn = bmp_pos & 7;
- bmp_pos &= ~7;
+ bmp_pos &= ~(LCN)7;
ntfs_debug("Before inner while loop: buf_size %i, lcn 0x%llx, "
"bmp_pos 0x%llx, need_writeback %i.", buf_size,
(unsigned long long)lcn,
(unsigned int)*byte);
/* Skip full bytes. */
if (*byte == 0xff) {
- lcn = (lcn + 8) & ~7;
+ lcn = (lcn + 8) & ~(LCN)7;
ntfs_debug("Continuing while loop 1.");
continue;
}
bit = 1 << (lcn & 7);
- ntfs_debug("bit %i.", bit);
+ ntfs_debug("bit 0x%x.", bit);
/* If the bit is already set, go onto the next one. */
if (*byte & bit) {
lcn++;
if (zone == MFT_ZONE || mft_zone_size <= 0) {
ntfs_debug("No free clusters left, going to out.");
/* Really no more space left on device. */
- err = ENOSPC;
+ err = -ENOSPC;
goto out;
} /* zone == DATA_ZONE && mft_zone_size > 0 */
ntfs_debug("Shrinking mft zone.");
/* Add runlist terminator element. */
if (likely(rl)) {
rl[rlpos].vcn = rl[rlpos - 1].vcn + rl[rlpos - 1].length;
- rl[rlpos].lcn = LCN_RL_NOT_MAPPED;
+ rl[rlpos].lcn = is_extension ? LCN_ENOENT : LCN_RL_NOT_MAPPED;
rl[rlpos].length = 0;
}
if (likely(page && !IS_ERR(page))) {
if (rl) {
int err2;
- if (err == ENOSPC)
+ if (err == -ENOSPC)
ntfs_debug("Not enough space to complete allocation, "
- "err ENOSPC, first free lcn 0x%llx, "
+ "err -ENOSPC, first free lcn 0x%llx, "
"could allocate up to 0x%llx "
"clusters.",
(unsigned long long)rl[0].lcn,
- (unsigned long long)count - clusters);
+ (unsigned long long)(count - clusters));
/* Deallocate all allocated clusters. */
ntfs_debug("Attempting rollback...");
err2 = ntfs_cluster_free_from_rl_nolock(vol, rl);
}
/* Free the runlist. */
ntfs_free(rl);
- } else if (err == ENOSPC)
- ntfs_debug("No space left at all, err = ENOSPC, "
- "first free lcn = 0x%llx.",
- (unsigned long long)vol->data1_zone_pos);
+ } else if (err == -ENOSPC)
+ ntfs_debug("No space left at all, err = -ENOSPC, first free "
+ "lcn = 0x%llx.",
+ (long long)vol->data1_zone_pos);
up_write(&vol->lcnbmp_lock);
return ERR_PTR(err);
}
/**
* __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
- * @is_rollback: if TRUE this is a rollback operation
+ * @ctx: active attribute search context if present or NULL if not
+ * @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
* @start_vcn = 0 and @count = -1.
*
+ * If @ctx is specified, it is an active search context of @ni and its base mft
+ * record. This is needed when __ntfs_cluster_free() encounters unmapped
+ * runlist fragments and allows their mapping. If you do not have the mft
+ * record mapped, you can specify @ctx as NULL and __ntfs_cluster_free() will
+ * perform the necessary mapping and unmapping.
+ *
+ * Note, __ntfs_cluster_free() saves the state of @ctx on entry and restores it
+ * before returning. Thus, @ctx will be left pointing to the same attribute on
+ * return as on entry. However, the actual pointers in @ctx may point to
+ * different memory locations on return, so you must remember to reset any
+ * cached pointers from the @ctx, i.e. after the call to __ntfs_cluster_free(),
+ * you will probably want to do:
+ * m = ctx->mrec;
+ * a = ctx->attr;
+ * Assuming you cache ctx->attr in a variable @a of type ATTR_RECORD * and that
+ * you cache ctx->mrec in a variable @m of type MFT_RECORD *.
+ *
* @is_rollback should always be FALSE, it is for internal use to rollback
* errors. You probably want to use ntfs_cluster_free() instead.
*
- * Note, ntfs_cluster_free() does not modify the runlist at all, so the caller
- * has to deal with it later.
+ * Note, __ntfs_cluster_free() does not modify the runlist, so you have to
+ * remove from the runlist or mark sparse the freed runs later.
*
* Return the number of deallocated clusters (not counting sparse ones) on
* success and -errno on error.
*
- * Locking: - The runlist described by @vi must be unlocked on entry and is
- * unlocked on return.
- * - This function takes the runlist lock of @vi for reading and
- * sometimes for writing and sometimes modifies the runlist.
+ * WARNING: If @ctx is supplied, regardless of whether success or failure is
+ * returned, you need to check IS_ERR(@ctx->mrec) and if TRUE the @ctx
+ * is no longer valid, i.e. you need to either call
+ * ntfs_attr_reinit_search_ctx() or ntfs_attr_put_search_ctx() on it.
+ * In that case PTR_ERR(@ctx->mrec) will give you the error code for
+ * why the mapping of the old inode failed.
+ *
+ * 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.
+ * - If @ctx is NULL, the base mft record of @ni must not be mapped on
+ * entry and it will be left unmapped on return.
+ * - If @ctx is not NULL, the base mft record must be mapped on entry
+ * and it will be left mapped on return.
*/
-s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn, s64 count,
- const BOOL is_rollback)
+s64 __ntfs_cluster_free(ntfs_inode *ni, const VCN start_vcn, s64 count,
+ ntfs_attr_search_ctx *ctx, 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);
total_freed = real_freed = 0;
- /* This returns with ni->runlist locked for reading on success. */
- rl = ntfs_find_vcn(ni, start_vcn, FALSE);
+ rl = ntfs_attr_find_vcn_nolock(ni, start_vcn, ctx);
if (IS_ERR(rl)) {
if (!is_rollback)
ntfs_error(vol->sb, "Failed to find first runlist "
ntfs_error(vol->sb, "First runlist element has "
"invalid lcn, aborting.");
err = -EIO;
- goto unl_err_out;
+ goto err_out;
}
/* Find the starting cluster inside the run that needs freeing. */
delta = start_vcn - rl->vcn;
if (!is_rollback)
ntfs_error(vol->sb, "Failed to clear first run "
"(error %i), aborting.", err);
- goto unl_err_out;
+ goto err_out;
}
/* We have freed @to_free real clusters. */
real_freed = to_free;
if (unlikely(rl->lcn < LCN_HOLE)) {
VCN vcn;
- /*
- * Attempt to map runlist, dropping runlist lock for
- * the duration.
- */
+ /* Attempt to map runlist. */
vcn = rl->vcn;
- up_read(&ni->runlist.lock);
- err = ntfs_map_runlist(ni, vcn);
- if (err) {
- if (!is_rollback)
- ntfs_error(vol->sb, "Failed to map "
- "runlist fragment.");
- if (err == -EINVAL || err == -ENOENT)
- err = -EIO;
- goto err_out;
- }
- /*
- * This returns with ni->runlist locked for reading on
- * success.
- */
- rl = ntfs_find_vcn(ni, vcn, FALSE);
+ rl = ntfs_attr_find_vcn_nolock(ni, vcn, ctx);
if (IS_ERR(rl)) {
err = PTR_ERR(rl);
if (!is_rollback)
- ntfs_error(vol->sb, "Failed to find "
+ ntfs_error(vol->sb, "Failed to map "
+ "runlist fragment or "
+ "failed to find "
"subsequent runlist "
"element.");
goto err_out;
(unsigned long long)
rl->lcn);
err = -EIO;
- goto unl_err_out;
+ goto err_out;
}
}
/* The number of clusters in this run that need freeing. */
if (!is_rollback)
ntfs_error(vol->sb, "Failed to clear "
"subsequent run.");
- goto unl_err_out;
+ goto err_out;
}
/* We have freed @to_free real clusters. */
real_freed += to_free;
/* Update the total done clusters. */
total_freed += to_free;
}
- up_read(&ni->runlist.lock);
if (likely(!is_rollback))
up_write(&vol->lcnbmp_lock);
/* We are done. Return the number of actually freed clusters. */
ntfs_debug("Done.");
return real_freed;
-unl_err_out:
- up_read(&ni->runlist.lock);
err_out:
if (is_rollback)
return err;
* 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, TRUE);
+ delta = __ntfs_cluster_free(ni, start_vcn, total_freed, ctx, TRUE);
if (delta < 0) {
ntfs_error(vol->sb, "Failed to rollback (error %i). Leaving "
"inconsistent metadata! Unmount and run "
git://git.onelab.eu / linux-2.6.git / blobdiff