diff options
Diffstat (limited to 'fs/jbd2/journal.c')
| -rw-r--r-- | fs/jbd2/journal.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index f6034ce4a107..5e408ee24a1a 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -840,6 +840,7 @@ jbd2_journal_get_descriptor_buffer(transaction_t *transaction, int type) bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); if (!bh) return NULL; + atomic_dec(&transaction->t_outstanding_credits); lock_buffer(bh); memset(bh->b_data, 0, journal->j_blocksize); header = (journal_header_t *)bh->b_data; @@ -1098,6 +1099,16 @@ static void jbd2_stats_proc_exit(journal_t *journal) remove_proc_entry(journal->j_devname, proc_jbd2_stats); } +/* Minimum size of descriptor tag */ +static int jbd2_min_tag_size(void) +{ + /* + * Tag with 32-bit block numbers does not use last four bytes of the + * structure + */ + return sizeof(journal_block_tag_t) - 4; +} + /* * Management for journal control blocks: functions to create and * destroy journal_t structures, and to initialise and read existing @@ -1156,7 +1167,8 @@ static journal_t *journal_init_common(struct block_device *bdev, journal->j_fs_dev = fs_dev; journal->j_blk_offset = start; journal->j_maxlen = len; - n = journal->j_blocksize / sizeof(journal_block_tag_t); + /* We need enough buffers to write out full descriptor block. */ + n = journal->j_blocksize / jbd2_min_tag_size(); journal->j_wbufsize = n; journal->j_wbuf = kmalloc_array(n, sizeof(struct buffer_head *), GFP_KERNEL); @@ -1488,6 +1500,21 @@ void jbd2_journal_update_sb_errno(journal_t *journal) } EXPORT_SYMBOL(jbd2_journal_update_sb_errno); +static int journal_revoke_records_per_block(journal_t *journal) +{ + int record_size; + int space = journal->j_blocksize - sizeof(jbd2_journal_revoke_header_t); + + if (jbd2_has_feature_64bit(journal)) + record_size = 8; + else + record_size = 4; + + if (jbd2_journal_has_csum_v2or3(journal)) + space -= sizeof(struct jbd2_journal_block_tail); + return space / record_size; +} + /* * Read the superblock for a given journal, performing initial * validation of the format. @@ -1596,6 +1623,8 @@ static int journal_get_superblock(journal_t *journal) sizeof(sb->s_uuid)); } + journal->j_revoke_records_per_block = + journal_revoke_records_per_block(journal); set_buffer_verified(bh); return 0; @@ -1916,6 +1945,8 @@ int jbd2_journal_set_features (journal_t *journal, unsigned long compat, sb->s_feature_ro_compat |= cpu_to_be32(ro); sb->s_feature_incompat |= cpu_to_be32(incompat); unlock_buffer(journal->j_sb_buffer); + journal->j_revoke_records_per_block = + journal_revoke_records_per_block(journal); return 1; #undef COMPAT_FEATURE_ON @@ -1946,6 +1977,8 @@ void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, sb->s_feature_compat &= ~cpu_to_be32(compat); sb->s_feature_ro_compat &= ~cpu_to_be32(ro); sb->s_feature_incompat &= ~cpu_to_be32(incompat); + journal->j_revoke_records_per_block = + journal_revoke_records_per_block(journal); } EXPORT_SYMBOL(jbd2_journal_clear_features); |