diff options
Diffstat (limited to 'fs/ext4/ext4_jbd2.h')
| -rw-r--r-- | fs/ext4/ext4_jbd2.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h index 99fe72522960..1920b976eef1 100644 --- a/fs/ext4/ext4_jbd2.h +++ b/fs/ext4/ext4_jbd2.h @@ -346,6 +346,54 @@ static inline int ext4_journal_restart(handle_t *handle, int nblocks) return 0; } +int __ext4_journal_ensure_credits(handle_t *handle, int check_cred, + int extend_cred); + + +/* + * Ensure @handle has at least @check_creds credits available. If not, + * transaction will be extended or restarted to contain at least @extend_cred + * credits. Before restarting transaction @fn is executed to allow for cleanup + * before the transaction is restarted. + * + * The return value is < 0 in case of error, 0 in case the handle has enough + * credits or transaction extension succeeded, 1 in case transaction had to be + * restarted. + */ +#define ext4_journal_ensure_credits_fn(handle, check_cred, extend_cred, fn) \ +({ \ + __label__ __ensure_end; \ + int err = __ext4_journal_ensure_credits((handle), (check_cred), \ + (extend_cred)); \ + \ + if (err <= 0) \ + goto __ensure_end; \ + err = (fn); \ + if (err < 0) \ + goto __ensure_end; \ + err = ext4_journal_restart((handle), (extend_cred)); \ + if (err == 0) \ + err = 1; \ +__ensure_end: \ + err; \ +}) + +/* + * Ensure given handle has at least requested amount of credits available, + * possibly restarting transaction if needed. + */ +static inline int ext4_journal_ensure_credits(handle_t *handle, int credits) +{ + return ext4_journal_ensure_credits_fn(handle, credits, credits, 0); +} + +static inline int ext4_journal_ensure_credits_batch(handle_t *handle, + int credits) +{ + return ext4_journal_ensure_credits_fn(handle, credits, + EXT4_MAX_TRANS_DATA, 0); +} + static inline int ext4_journal_blocks_per_page(struct inode *inode) { if (EXT4_JOURNAL(inode) != NULL) |