UBIFS: add new flash file system
This is a new flash file system. See
http://www.linux-mtd.infradead.org/doc/ubifs.html
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
diff --git a/fs/ubifs/budget.c b/fs/ubifs/budget.c
new file mode 100644
index 0000000..d81fb9e
--- /dev/null
+++ b/fs/ubifs/budget.c
@@ -0,0 +1,731 @@
+/*
+ * This file is part of UBIFS.
+ *
+ * Copyright (C) 2006-2008 Nokia Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Authors: Adrian Hunter
+ * Artem Bityutskiy (Битюцкий Артём)
+ */
+
+/*
+ * This file implements the budgeting sub-system which is responsible for UBIFS
+ * space management.
+ *
+ * Factors such as compression, wasted space at the ends of LEBs, space in other
+ * journal heads, the effect of updates on the index, and so on, make it
+ * impossible to accurately predict the amount of space needed. Consequently
+ * approximations are used.
+ */
+
+#include "ubifs.h"
+#include <linux/writeback.h>
+#include <asm/div64.h>
+
+/*
+ * When pessimistic budget calculations say that there is no enough space,
+ * UBIFS starts writing back dirty inodes and pages, doing garbage collection,
+ * or committing. The below constants define maximum number of times UBIFS
+ * repeats the operations.
+ */
+#define MAX_SHRINK_RETRIES 8
+#define MAX_GC_RETRIES 4
+#define MAX_CMT_RETRIES 2
+#define MAX_NOSPC_RETRIES 1
+
+/*
+ * The below constant defines amount of dirty pages which should be written
+ * back at when trying to shrink the liability.
+ */
+#define NR_TO_WRITE 16
+
+/**
+ * struct retries_info - information about re-tries while making free space.
+ * @prev_liability: previous liability
+ * @shrink_cnt: how many times the liability was shrinked
+ * @shrink_retries: count of liability shrink re-tries (increased when
+ * liability does not shrink)
+ * @try_gc: GC should be tried first
+ * @gc_retries: how many times GC was run
+ * @cmt_retries: how many times commit has been done
+ * @nospc_retries: how many times GC returned %-ENOSPC
+ *
+ * Since we consider budgeting to be the fast-path, and this structure has to
+ * be allocated on stack and zeroed out, we make it smaller using bit-fields.
+ */
+struct retries_info {
+ long long prev_liability;
+ unsigned int shrink_cnt;
+ unsigned int shrink_retries:5;
+ unsigned int try_gc:1;
+ unsigned int gc_retries:4;
+ unsigned int cmt_retries:3;
+ unsigned int nospc_retries:1;
+};
+
+/**
+ * shrink_liability - write-back some dirty pages/inodes.
+ * @c: UBIFS file-system description object
+ * @nr_to_write: how many dirty pages to write-back
+ *
+ * This function shrinks UBIFS liability by means of writing back some amount
+ * of dirty inodes and their pages. Returns the amount of pages which were
+ * written back. The returned value does not include dirty inodes which were
+ * synchronized.
+ *
+ * Note, this function synchronizes even VFS inodes which are locked
+ * (@i_mutex) by the caller of the budgeting function, because write-back does
+ * not touch @i_mutex.
+ */
+static int shrink_liability(struct ubifs_info *c, int nr_to_write)
+{
+ int nr_written;
+ struct writeback_control wbc = {
+ .sync_mode = WB_SYNC_NONE,
+ .range_end = LLONG_MAX,
+ .nr_to_write = nr_to_write,
+ };
+
+ generic_sync_sb_inodes(c->vfs_sb, &wbc);
+ nr_written = nr_to_write - wbc.nr_to_write;
+
+ if (!nr_written) {
+ /*
+ * Re-try again but wait on pages/inodes which are being
+ * written-back concurrently (e.g., by pdflush).
+ */
+ memset(&wbc, 0, sizeof(struct writeback_control));
+ wbc.sync_mode = WB_SYNC_ALL;
+ wbc.range_end = LLONG_MAX;
+ wbc.nr_to_write = nr_to_write;
+ generic_sync_sb_inodes(c->vfs_sb, &wbc);
+ nr_written = nr_to_write - wbc.nr_to_write;
+ }
+
+ dbg_budg("%d pages were written back", nr_written);
+ return nr_written;
+}
+
+
+/**
+ * run_gc - run garbage collector.
+ * @c: UBIFS file-system description object
+ *
+ * This function runs garbage collector to make some more free space. Returns
+ * zero if a free LEB has been produced, %-EAGAIN if commit is required, and a
+ * negative error code in case of failure.
+ */
+static int run_gc(struct ubifs_info *c)
+{
+ int err, lnum;
+
+ /* Make some free space by garbage-collecting dirty space */
+ down_read(&c->commit_sem);
+ lnum = ubifs_garbage_collect(c, 1);
+ up_read(&c->commit_sem);
+ if (lnum < 0)
+ return lnum;
+
+ /* GC freed one LEB, return it to lprops */
+ dbg_budg("GC freed LEB %d", lnum);
+ err = ubifs_return_leb(c, lnum);
+ if (err)
+ return err;
+ return 0;
+}
+
+/**
+ * make_free_space - make more free space on the file-system.
+ * @c: UBIFS file-system description object
+ * @ri: information about previous invocations of this function
+ *
+ * This function is called when an operation cannot be budgeted because there
+ * is supposedly no free space. But in most cases there is some free space:
+ * o budgeting is pessimistic, so it always budgets more then it is actually
+ * needed, so shrinking the liability is one way to make free space - the
+ * cached data will take less space then it was budgeted for;
+ * o GC may turn some dark space into free space (budgeting treats dark space
+ * as not available);
+ * o commit may free some LEB, i.e., turn freeable LEBs into free LEBs.
+ *
+ * So this function tries to do the above. Returns %-EAGAIN if some free space
+ * was presumably made and the caller has to re-try budgeting the operation.
+ * Returns %-ENOSPC if it couldn't do more free space, and other negative error
+ * codes on failures.
+ */
+static int make_free_space(struct ubifs_info *c, struct retries_info *ri)
+{
+ int err;
+
+ /*
+ * If we have some dirty pages and inodes (liability), try to write
+ * them back unless this was tried too many times without effect
+ * already.
+ */
+ if (ri->shrink_retries < MAX_SHRINK_RETRIES && !ri->try_gc) {
+ long long liability;
+
+ spin_lock(&c->space_lock);
+ liability = c->budg_idx_growth + c->budg_data_growth +
+ c->budg_dd_growth;
+ spin_unlock(&c->space_lock);
+
+ if (ri->prev_liability >= liability) {
+ /* Liability does not shrink, next time try GC then */
+ ri->shrink_retries += 1;
+ if (ri->gc_retries < MAX_GC_RETRIES)
+ ri->try_gc = 1;
+ dbg_budg("liability did not shrink: retries %d of %d",
+ ri->shrink_retries, MAX_SHRINK_RETRIES);
+ }
+
+ dbg_budg("force write-back (count %d)", ri->shrink_cnt);
+ shrink_liability(c, NR_TO_WRITE + ri->shrink_cnt);
+
+ ri->prev_liability = liability;
+ ri->shrink_cnt += 1;
+ return -EAGAIN;
+ }
+
+ /*
+ * Try to run garbage collector unless it was already tried too many
+ * times.
+ */
+ if (ri->gc_retries < MAX_GC_RETRIES) {
+ ri->gc_retries += 1;
+ dbg_budg("run GC, retries %d of %d",
+ ri->gc_retries, MAX_GC_RETRIES);
+
+ ri->try_gc = 0;
+ err = run_gc(c);
+ if (!err)
+ return -EAGAIN;
+
+ if (err == -EAGAIN) {
+ dbg_budg("GC asked to commit");
+ err = ubifs_run_commit(c);
+ if (err)
+ return err;
+ return -EAGAIN;
+ }
+
+ if (err != -ENOSPC)
+ return err;
+
+ /*
+ * GC could not make any progress. If this is the first time,
+ * then it makes sense to try to commit, because it might make
+ * some dirty space.
+ */
+ dbg_budg("GC returned -ENOSPC, retries %d",
+ ri->nospc_retries);
+ if (ri->nospc_retries >= MAX_NOSPC_RETRIES)
+ return err;
+ ri->nospc_retries += 1;
+ }
+
+ /* Neither GC nor write-back helped, try to commit */
+ if (ri->cmt_retries < MAX_CMT_RETRIES) {
+ ri->cmt_retries += 1;
+ dbg_budg("run commit, retries %d of %d",
+ ri->cmt_retries, MAX_CMT_RETRIES);
+ err = ubifs_run_commit(c);
+ if (err)
+ return err;
+ return -EAGAIN;
+ }
+ return -ENOSPC;
+}
+
+/**
+ * ubifs_calc_min_idx_lebs - calculate amount of eraseblocks for the index.
+ * @c: UBIFS file-system description object
+ *
+ * This function calculates and returns the number of eraseblocks which should
+ * be kept for index usage.
+ */
+int ubifs_calc_min_idx_lebs(struct ubifs_info *c)
+{
+ int ret;
+ uint64_t idx_size;
+
+ idx_size = c->old_idx_sz + c->budg_idx_growth + c->budg_uncommitted_idx;
+
+ /* And make sure we have twice the index size of space reserved */
+ idx_size <<= 1;
+
+ /*
+ * We do not maintain 'old_idx_size' as 'old_idx_lebs'/'old_idx_bytes'
+ * pair, nor similarly the two variables for the new index size, so we
+ * have to do this costly 64-bit division on fast-path.
+ */
+ if (do_div(idx_size, c->leb_size - c->max_idx_node_sz))
+ ret = idx_size + 1;
+ else
+ ret = idx_size;
+ /*
+ * The index head is not available for the in-the-gaps method, so add an
+ * extra LEB to compensate.
+ */
+ ret += 1;
+ /*
+ * At present the index needs at least 2 LEBs: one for the index head
+ * and one for in-the-gaps method (which currently does not cater for
+ * the index head and so excludes it from consideration).
+ */
+ if (ret < 2)
+ ret = 2;
+ return ret;
+}
+
+/**
+ * ubifs_calc_available - calculate available FS space.
+ * @c: UBIFS file-system description object
+ * @min_idx_lebs: minimum number of LEBs reserved for the index
+ *
+ * This function calculates and returns amount of FS space available for use.
+ */
+long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs)
+{
+ int subtract_lebs;
+ long long available;
+
+ /*
+ * Force the amount available to the total size reported if the used
+ * space is zero.
+ */
+ if (c->lst.total_used <= UBIFS_INO_NODE_SZ &&
+ c->budg_data_growth + c->budg_dd_growth == 0) {
+ /* Do the same calculation as for c->block_cnt */
+ available = c->main_lebs - 2;
+ available *= c->leb_size - c->dark_wm;
+ return available;
+ }
+
+ available = c->main_bytes - c->lst.total_used;
+
+ /*
+ * Now 'available' contains theoretically available flash space
+ * assuming there is no index, so we have to subtract the space which
+ * is reserved for the index.
+ */
+ subtract_lebs = min_idx_lebs;
+
+ /* Take into account that GC reserves one LEB for its own needs */
+ subtract_lebs += 1;
+
+ /*
+ * The GC journal head LEB is not really accessible. And since
+ * different write types go to different heads, we may count only on
+ * one head's space.
+ */
+ subtract_lebs += c->jhead_cnt - 1;
+
+ /* We also reserve one LEB for deletions, which bypass budgeting */
+ subtract_lebs += 1;
+
+ available -= (long long)subtract_lebs * c->leb_size;
+
+ /* Subtract the dead space which is not available for use */
+ available -= c->lst.total_dead;
+
+ /*
+ * Subtract dark space, which might or might not be usable - it depends
+ * on the data which we have on the media and which will be written. If
+ * this is a lot of uncompressed or not-compressible data, the dark
+ * space cannot be used.
+ */
+ available -= c->lst.total_dark;
+
+ /*
+ * However, there is more dark space. The index may be bigger than
+ * @min_idx_lebs. Those extra LEBs are assumed to be available, but
+ * their dark space is not included in total_dark, so it is subtracted
+ * here.
+ */
+ if (c->lst.idx_lebs > min_idx_lebs) {
+ subtract_lebs = c->lst.idx_lebs - min_idx_lebs;
+ available -= subtract_lebs * c->dark_wm;
+ }
+
+ /* The calculations are rough and may end up with a negative number */
+ return available > 0 ? available : 0;
+}
+
+/**
+ * can_use_rp - check whether the user is allowed to use reserved pool.
+ * @c: UBIFS file-system description object
+ *
+ * UBIFS has so-called "reserved pool" which is flash space reserved
+ * for the superuser and for uses whose UID/GID is recorded in UBIFS superblock.
+ * This function checks whether current user is allowed to use reserved pool.
+ * Returns %1 current user is allowed to use reserved pool and %0 otherwise.
+ */
+static int can_use_rp(struct ubifs_info *c)
+{
+ if (current->fsuid == c->rp_uid || capable(CAP_SYS_RESOURCE) ||
+ (c->rp_gid != 0 && in_group_p(c->rp_gid)))
+ return 1;
+ return 0;
+}
+
+/**
+ * do_budget_space - reserve flash space for index and data growth.
+ * @c: UBIFS file-system description object
+ *
+ * This function makes sure UBIFS has enough free eraseblocks for index growth
+ * and data.
+ *
+ * When budgeting index space, UBIFS reserves twice as more LEBs as the index
+ * would take if it was consolidated and written to the flash. This guarantees
+ * that the "in-the-gaps" commit method always succeeds and UBIFS will always
+ * be able to commit dirty index. So this function basically adds amount of
+ * budgeted index space to the size of the current index, multiplies this by 2,
+ * and makes sure this does not exceed the amount of free eraseblocks.
+ *
+ * Notes about @c->min_idx_lebs and @c->lst.idx_lebs variables:
+ * o @c->lst.idx_lebs is the number of LEBs the index currently uses. It might
+ * be large, because UBIFS does not do any index consolidation as long as
+ * there is free space. IOW, the index may take a lot of LEBs, but the LEBs
+ * will contain a lot of dirt.
+ * o @c->min_idx_lebs is the the index presumably takes. IOW, the index may be
+ * consolidated to take up to @c->min_idx_lebs LEBs.
+ *
+ * This function returns zero in case of success, and %-ENOSPC in case of
+ * failure.
+ */
+static int do_budget_space(struct ubifs_info *c)
+{
+ long long outstanding, available;
+ int lebs, rsvd_idx_lebs, min_idx_lebs;
+
+ /* First budget index space */
+ min_idx_lebs = ubifs_calc_min_idx_lebs(c);
+
+ /* Now 'min_idx_lebs' contains number of LEBs to reserve */
+ if (min_idx_lebs > c->lst.idx_lebs)
+ rsvd_idx_lebs = min_idx_lebs - c->lst.idx_lebs;
+ else
+ rsvd_idx_lebs = 0;
+
+ /*
+ * The number of LEBs that are available to be used by the index is:
+ *
+ * @c->lst.empty_lebs + @c->freeable_cnt + @c->idx_gc_cnt -
+ * @c->lst.taken_empty_lebs
+ *
+ * @empty_lebs are available because they are empty. @freeable_cnt are
+ * available because they contain only free and dirty space and the
+ * index allocation always occurs after wbufs are synch'ed.
+ * @idx_gc_cnt are available because they are index LEBs that have been
+ * garbage collected (including trivial GC) and are awaiting the commit
+ * before they can be unmapped - note that the in-the-gaps method will
+ * grab these if it needs them. @taken_empty_lebs are empty_lebs that
+ * have already been allocated for some purpose (also includes those
+ * LEBs on the @idx_gc list).
+ *
+ * Note, @taken_empty_lebs may temporarily be higher by one because of
+ * the way we serialize LEB allocations and budgeting. See a comment in
+ * 'ubifs_find_free_space()'.
+ */
+ lebs = c->lst.empty_lebs + c->freeable_cnt + c->idx_gc_cnt -
+ c->lst.taken_empty_lebs;
+ if (unlikely(rsvd_idx_lebs > lebs)) {
+ dbg_budg("out of indexing space: min_idx_lebs %d (old %d), "
+ "rsvd_idx_lebs %d", min_idx_lebs, c->min_idx_lebs,
+ rsvd_idx_lebs);
+ return -ENOSPC;
+ }
+
+ available = ubifs_calc_available(c, min_idx_lebs);
+ outstanding = c->budg_data_growth + c->budg_dd_growth;
+
+ if (unlikely(available < outstanding)) {
+ dbg_budg("out of data space: available %lld, outstanding %lld",
+ available, outstanding);
+ return -ENOSPC;
+ }
+
+ if (available - outstanding <= c->rp_size && !can_use_rp(c))
+ return -ENOSPC;
+
+ c->min_idx_lebs = min_idx_lebs;
+ return 0;
+}
+
+/**
+ * calc_idx_growth - calculate approximate index growth from budgeting request.
+ * @c: UBIFS file-system description object
+ * @req: budgeting request
+ *
+ * For now we assume each new node adds one znode. But this is rather poor
+ * approximation, though.
+ */
+static int calc_idx_growth(const struct ubifs_info *c,
+ const struct ubifs_budget_req *req)
+{
+ int znodes;
+
+ znodes = req->new_ino + (req->new_page << UBIFS_BLOCKS_PER_PAGE_SHIFT) +
+ req->new_dent;
+ return znodes * c->max_idx_node_sz;
+}
+
+/**
+ * calc_data_growth - calculate approximate amount of new data from budgeting
+ * request.
+ * @c: UBIFS file-system description object
+ * @req: budgeting request
+ */
+static int calc_data_growth(const struct ubifs_info *c,
+ const struct ubifs_budget_req *req)
+{
+ int data_growth;
+
+ data_growth = req->new_ino ? c->inode_budget : 0;
+ if (req->new_page)
+ data_growth += c->page_budget;
+ if (req->new_dent)
+ data_growth += c->dent_budget;
+ data_growth += req->new_ino_d;
+ return data_growth;
+}
+
+/**
+ * calc_dd_growth - calculate approximate amount of data which makes other data
+ * dirty from budgeting request.
+ * @c: UBIFS file-system description object
+ * @req: budgeting request
+ */
+static int calc_dd_growth(const struct ubifs_info *c,
+ const struct ubifs_budget_req *req)
+{
+ int dd_growth;
+
+ dd_growth = req->dirtied_page ? c->page_budget : 0;
+
+ if (req->dirtied_ino)
+ dd_growth += c->inode_budget << (req->dirtied_ino - 1);
+ if (req->mod_dent)
+ dd_growth += c->dent_budget;
+ dd_growth += req->dirtied_ino_d;
+ return dd_growth;
+}
+
+/**
+ * ubifs_budget_space - ensure there is enough space to complete an operation.
+ * @c: UBIFS file-system description object
+ * @req: budget request
+ *
+ * This function allocates budget for an operation. It uses pessimistic
+ * approximation of how much flash space the operation needs. The goal of this
+ * function is to make sure UBIFS always has flash space to flush all dirty
+ * pages, dirty inodes, and dirty znodes (liability). This function may force
+ * commit, garbage-collection or write-back. Returns zero in case of success,
+ * %-ENOSPC if there is no free space and other negative error codes in case of
+ * failures.
+ */
+int ubifs_budget_space(struct ubifs_info *c, struct ubifs_budget_req *req)
+{
+ int uninitialized_var(cmt_retries), uninitialized_var(wb_retries);
+ int err, idx_growth, data_growth, dd_growth;
+ struct retries_info ri;
+
+ ubifs_assert(req->dirtied_ino <= 4);
+ ubifs_assert(req->dirtied_ino_d <= UBIFS_MAX_INO_DATA * 4);
+
+ data_growth = calc_data_growth(c, req);
+ dd_growth = calc_dd_growth(c, req);
+ if (!data_growth && !dd_growth)
+ return 0;
+ idx_growth = calc_idx_growth(c, req);
+ memset(&ri, 0, sizeof(struct retries_info));
+
+again:
+ spin_lock(&c->space_lock);
+ ubifs_assert(c->budg_idx_growth >= 0);
+ ubifs_assert(c->budg_data_growth >= 0);
+ ubifs_assert(c->budg_dd_growth >= 0);
+
+ if (unlikely(c->nospace) && (c->nospace_rp || !can_use_rp(c))) {
+ dbg_budg("no space");
+ spin_unlock(&c->space_lock);
+ return -ENOSPC;
+ }
+
+ c->budg_idx_growth += idx_growth;
+ c->budg_data_growth += data_growth;
+ c->budg_dd_growth += dd_growth;
+
+ err = do_budget_space(c);
+ if (likely(!err)) {
+ req->idx_growth = idx_growth;
+ req->data_growth = data_growth;
+ req->dd_growth = dd_growth;
+ spin_unlock(&c->space_lock);
+ return 0;
+ }
+
+ /* Restore the old values */
+ c->budg_idx_growth -= idx_growth;
+ c->budg_data_growth -= data_growth;
+ c->budg_dd_growth -= dd_growth;
+ spin_unlock(&c->space_lock);
+
+ if (req->fast) {
+ dbg_budg("no space for fast budgeting");
+ return err;
+ }
+
+ err = make_free_space(c, &ri);
+ if (err == -EAGAIN) {
+ dbg_budg("try again");
+ cond_resched();
+ goto again;
+ } else if (err == -ENOSPC) {
+ dbg_budg("FS is full, -ENOSPC");
+ c->nospace = 1;
+ if (can_use_rp(c) || c->rp_size == 0)
+ c->nospace_rp = 1;
+ smp_wmb();
+ } else
+ ubifs_err("cannot budget space, error %d", err);
+ return err;
+}
+
+/**
+ * ubifs_release_budget - release budgeted free space.
+ * @c: UBIFS file-system description object
+ * @req: budget request
+ *
+ * This function releases the space budgeted by 'ubifs_budget_space()'. Note,
+ * since the index changes (which were budgeted for in @req->idx_growth) will
+ * only be written to the media on commit, this function moves the index budget
+ * from @c->budg_idx_growth to @c->budg_uncommitted_idx. The latter will be
+ * zeroed by the commit operation.
+ */
+void ubifs_release_budget(struct ubifs_info *c, struct ubifs_budget_req *req)
+{
+ ubifs_assert(req->dirtied_ino <= 4);
+ ubifs_assert(req->dirtied_ino_d <= UBIFS_MAX_INO_DATA * 4);
+ if (!req->recalculate) {
+ ubifs_assert(req->idx_growth >= 0);
+ ubifs_assert(req->data_growth >= 0);
+ ubifs_assert(req->dd_growth >= 0);
+ }
+
+ if (req->recalculate) {
+ req->data_growth = calc_data_growth(c, req);
+ req->dd_growth = calc_dd_growth(c, req);
+ req->idx_growth = calc_idx_growth(c, req);
+ }
+
+ if (!req->data_growth && !req->dd_growth)
+ return;
+
+ c->nospace = c->nospace_rp = 0;
+ smp_wmb();
+
+ spin_lock(&c->space_lock);
+ c->budg_idx_growth -= req->idx_growth;
+ c->budg_uncommitted_idx += req->idx_growth;
+ c->budg_data_growth -= req->data_growth;
+ c->budg_dd_growth -= req->dd_growth;
+ c->min_idx_lebs = ubifs_calc_min_idx_lebs(c);
+
+ ubifs_assert(c->budg_idx_growth >= 0);
+ ubifs_assert(c->budg_data_growth >= 0);
+ ubifs_assert(c->min_idx_lebs < c->main_lebs);
+ spin_unlock(&c->space_lock);
+}
+
+/**
+ * ubifs_convert_page_budget - convert budget of a new page.
+ * @c: UBIFS file-system description object
+ *
+ * This function converts budget which was allocated for a new page of data to
+ * the budget of changing an existing page of data. The latter is smaller then
+ * the former, so this function only does simple re-calculation and does not
+ * involve any write-back.
+ */
+void ubifs_convert_page_budget(struct ubifs_info *c)
+{
+ spin_lock(&c->space_lock);
+ /* Release the index growth reservation */
+ c->budg_idx_growth -= c->max_idx_node_sz << UBIFS_BLOCKS_PER_PAGE_SHIFT;
+ /* Release the data growth reservation */
+ c->budg_data_growth -= c->page_budget;
+ /* Increase the dirty data growth reservation instead */
+ c->budg_dd_growth += c->page_budget;
+ /* And re-calculate the indexing space reservation */
+ c->min_idx_lebs = ubifs_calc_min_idx_lebs(c);
+ spin_unlock(&c->space_lock);
+}
+
+/**
+ * ubifs_release_dirty_inode_budget - release dirty inode budget.
+ * @c: UBIFS file-system description object
+ * @ui: UBIFS inode to release the budget for
+ *
+ * This function releases budget corresponding to a dirty inode. It is usually
+ * called when after the inode has been written to the media and marked as
+ * clean.
+ */
+void ubifs_release_dirty_inode_budget(struct ubifs_info *c,
+ struct ubifs_inode *ui)
+{
+ struct ubifs_budget_req req = {.dd_growth = c->inode_budget,
+ .dirtied_ino_d = ui->data_len};
+
+ ubifs_release_budget(c, &req);
+}
+
+/**
+ * ubifs_budg_get_free_space - return amount of free space.
+ * @c: UBIFS file-system description object
+ *
+ * This function returns amount of free space on the file-system.
+ */
+long long ubifs_budg_get_free_space(struct ubifs_info *c)
+{
+ int min_idx_lebs, rsvd_idx_lebs;
+ long long available, outstanding, free;
+
+ /* Do exactly the same calculations as in 'do_budget_space()' */
+ spin_lock(&c->space_lock);
+ min_idx_lebs = ubifs_calc_min_idx_lebs(c);
+
+ if (min_idx_lebs > c->lst.idx_lebs)
+ rsvd_idx_lebs = min_idx_lebs - c->lst.idx_lebs;
+ else
+ rsvd_idx_lebs = 0;
+
+ if (rsvd_idx_lebs > c->lst.empty_lebs + c->freeable_cnt + c->idx_gc_cnt
+ - c->lst.taken_empty_lebs) {
+ spin_unlock(&c->space_lock);
+ return 0;
+ }
+
+ available = ubifs_calc_available(c, min_idx_lebs);
+ outstanding = c->budg_data_growth + c->budg_dd_growth;
+ c->min_idx_lebs = min_idx_lebs;
+ spin_unlock(&c->space_lock);
+
+ if (available > outstanding)
+ free = ubifs_reported_space(c, available - outstanding);
+ else
+ free = 0;
+ return free;
+}