Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Linus Torvalds [Fri, 31 Oct 2008 14:52:12 +0000 (07:52 -0700)]
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  delay capable() check in ext4_has_free_blocks()
  merge ext4_claim_free_blocks & ext4_has_free_blocks
  jbd2: Call the commit callback before the transaction could get dropped
  ext4: fix a bug accessing freed memory in ext4_abort
  ext3: fix a bug accessing freed memory in ext3_abort

fs/ext3/super.c
fs/ext4/balloc.c
fs/ext4/ext4.h
fs/ext4/super.c
fs/jbd2/commit.c

index 18eaa78..e5717a4 100644 (file)
@@ -281,7 +281,8 @@ void ext3_abort (struct super_block * sb, const char * function,
        EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
        sb->s_flags |= MS_RDONLY;
        EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
-       journal_abort(EXT3_SB(sb)->s_journal, -EIO);
+       if (EXT3_SB(sb)->s_journal)
+               journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 }
 
 void ext3_warning (struct super_block * sb, const char * function,
@@ -390,11 +391,14 @@ static void ext3_put_super (struct super_block * sb)
 {
        struct ext3_sb_info *sbi = EXT3_SB(sb);
        struct ext3_super_block *es = sbi->s_es;
-       int i;
+       int i, err;
 
        ext3_xattr_put_super(sb);
-       if (journal_destroy(sbi->s_journal) < 0)
+       err = journal_destroy(sbi->s_journal);
+       sbi->s_journal = NULL;
+       if (err < 0)
                ext3_abort(sb, __func__, "Couldn't clean up the journal");
+
        if (!(sb->s_flags & MS_RDONLY)) {
                EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
                es->s_state = cpu_to_le16(sbi->s_mount_state);
index b9821be..d2003cd 100644 (file)
@@ -589,21 +589,23 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
        return;
 }
 
-int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
-                                               s64 nblocks)
+/**
+ * ext4_has_free_blocks()
+ * @sbi:       in-core super block structure.
+ * @nblocks:   number of needed blocks
+ *
+ * Check if filesystem has nblocks free & available for allocation.
+ * On success return 1, return 0 on failure.
+ */
+int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
 {
-       s64 free_blocks, dirty_blocks;
-       s64 root_blocks = 0;
+       s64 free_blocks, dirty_blocks, root_blocks;
        struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
        struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter;
 
        free_blocks  = percpu_counter_read_positive(fbc);
        dirty_blocks = percpu_counter_read_positive(dbc);
-
-       if (!capable(CAP_SYS_RESOURCE) &&
-               sbi->s_resuid != current->fsuid &&
-               (sbi->s_resgid == 0 || !in_group_p(sbi->s_resgid)))
-               root_blocks = ext4_r_blocks_count(sbi->s_es);
+       root_blocks = ext4_r_blocks_count(sbi->s_es);
 
        if (free_blocks - (nblocks + root_blocks + dirty_blocks) <
                                                EXT4_FREEBLOCKS_WATERMARK) {
@@ -616,57 +618,32 @@ int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
                }
        }
        /* Check whether we have space after
-        * accounting for current dirty blocks
+        * accounting for current dirty blocks & root reserved blocks.
         */
-       if (free_blocks < ((root_blocks + nblocks) + dirty_blocks))
-               /* we don't have free space */
-               return -ENOSPC;
+       if (free_blocks >= ((root_blocks + nblocks) + dirty_blocks))
+               return 1;
+
+       /* Hm, nope.  Are (enough) root reserved blocks available? */
+       if (sbi->s_resuid == current->fsuid ||
+           ((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) ||
+           capable(CAP_SYS_RESOURCE)) {
+               if (free_blocks >= (nblocks + dirty_blocks))
+                       return 1;
+       }
 
-       /* Add the blocks to nblocks */
-       percpu_counter_add(dbc, nblocks);
        return 0;
 }
 
-/**
- * ext4_has_free_blocks()
- * @sbi:       in-core super block structure.
- * @nblocks:   number of neeed blocks
- *
- * Check if filesystem has free blocks available for allocation.
- * Return the number of blocks avaible for allocation for this request
- * On success, return nblocks
- */
-ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
+int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
                                                s64 nblocks)
 {
-       s64 free_blocks, dirty_blocks;
-       s64 root_blocks = 0;
-       struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
-       struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter;
-
-       free_blocks  = percpu_counter_read_positive(fbc);
-       dirty_blocks = percpu_counter_read_positive(dbc);
-
-       if (!capable(CAP_SYS_RESOURCE) &&
-               sbi->s_resuid != current->fsuid &&
-               (sbi->s_resgid == 0 || !in_group_p(sbi->s_resgid)))
-               root_blocks = ext4_r_blocks_count(sbi->s_es);
-
-       if (free_blocks - (nblocks + root_blocks + dirty_blocks) <
-                                               EXT4_FREEBLOCKS_WATERMARK) {
-               free_blocks  = percpu_counter_sum(fbc);
-               dirty_blocks = percpu_counter_sum(dbc);
-       }
-       if (free_blocks <= (root_blocks + dirty_blocks))
-               /* we don't have free space */
+       if (ext4_has_free_blocks(sbi, nblocks)) {
+               percpu_counter_add(&sbi->s_dirtyblocks_counter, nblocks);
                return 0;
-
-       if (free_blocks - (root_blocks + dirty_blocks) < nblocks)
-               return free_blocks - (root_blocks + dirty_blocks);
-       return nblocks;
+       } else
+               return -ENOSPC;
 }
 
-
 /**
  * ext4_should_retry_alloc()
  * @sb:                        super block
index 4880cc3..b0537c8 100644 (file)
@@ -1003,8 +1003,7 @@ extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
                                        ext4_lblk_t iblock, ext4_fsblk_t goal,
                                        unsigned long *count, int *errp);
 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
-extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
-                                        s64 nblocks);
+extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
                        ext4_fsblk_t block, unsigned long count, int metadata);
 extern void ext4_free_blocks_sb(handle_t *handle, struct super_block *sb,
index bdddea1..994859d 100644 (file)
@@ -333,7 +333,8 @@ void ext4_abort(struct super_block *sb, const char *function,
        EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
        sb->s_flags |= MS_RDONLY;
        EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
-       jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
+       if (EXT4_SB(sb)->s_journal)
+               jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
 }
 
 void ext4_warning(struct super_block *sb, const char *function,
@@ -442,14 +443,16 @@ static void ext4_put_super(struct super_block *sb)
 {
        struct ext4_sb_info *sbi = EXT4_SB(sb);
        struct ext4_super_block *es = sbi->s_es;
-       int i;
+       int i, err;
 
        ext4_mb_release(sb);
        ext4_ext_release(sb);
        ext4_xattr_put_super(sb);
-       if (jbd2_journal_destroy(sbi->s_journal) < 0)
-               ext4_abort(sb, __func__, "Couldn't clean up the journal");
+       err = jbd2_journal_destroy(sbi->s_journal);
        sbi->s_journal = NULL;
+       if (err < 0)
+               ext4_abort(sb, __func__, "Couldn't clean up the journal");
+
        if (!(sb->s_flags & MS_RDONLY)) {
                EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
                es->s_state = cpu_to_le16(sbi->s_mount_state);
index 8b119e1..ebc667b 100644 (file)
@@ -974,6 +974,9 @@ restart_loop:
        journal->j_committing_transaction = NULL;
        spin_unlock(&journal->j_state_lock);
 
+       if (journal->j_commit_callback)
+               journal->j_commit_callback(journal, commit_transaction);
+
        if (commit_transaction->t_checkpoint_list == NULL &&
            commit_transaction->t_checkpoint_io_list == NULL) {
                __jbd2_journal_drop_transaction(journal, commit_transaction);
@@ -995,11 +998,8 @@ restart_loop:
        }
        spin_unlock(&journal->j_list_lock);
 
-       if (journal->j_commit_callback)
-               journal->j_commit_callback(journal, commit_transaction);
-
        trace_mark(jbd2_end_commit, "dev %s transaction %d head %d",
-                  journal->j_devname, commit_transaction->t_tid,
+                  journal->j_devname, journal->j_commit_sequence,
                   journal->j_tail_sequence);
        jbd_debug(1, "JBD: commit %d complete, head %d\n",
                  journal->j_commit_sequence, journal->j_tail_sequence);