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| author | Richard Weinberger <richard@nod.at> | 2019-08-14 00:55:48 +0300 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2019-08-22 18:24:59 +0300 |
| commit | 377e208f44784174f3002d9892d553715a3ab71b (patch) | |
| tree | 77496a5741b4a9ba2d332db389d00e033a438c85 /fs | |
| parent | 4dd75b335bc1f10fb1a01b5cd58870d47c13c4e7 (diff) | |
| download | linux-377e208f44784174f3002d9892d553715a3ab71b.tar.xz | |
ubifs: Correctly initialize c->min_log_bytes
Currently on a freshly mounted UBIFS, c->min_log_bytes is 0.
This can lead to a log overrun and make commits fail.
Recent kernels will report the following assert:
UBIFS assert failed: c->lhead_lnum != c->ltail_lnum, in fs/ubifs/log.c:412
c->min_log_bytes can have two states, 0 and c->leb_size.
It controls how much bytes of the log area are reserved for non-bud
nodes such as commit nodes.
After a commit it has to be set to c->leb_size such that we have always
enough space for a commit. While a commit runs it can be 0 to make the
remaining bytes of the log available to writers.
Having it set to 0 right after mount is wrong since no space for commits
is reserved.
Fixes: 1e51764a3c2ac ("UBIFS: add new flash file system")
Reported-and-tested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ubifs/super.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 2c0803b0ac3a..8c1d571334bc 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -609,6 +609,10 @@ static int init_constants_early(struct ubifs_info *c) c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; if (c->max_bu_buf_len > c->leb_size) c->max_bu_buf_len = c->leb_size; + + /* Log is ready, preserve one LEB for commits. */ + c->min_log_bytes = c->leb_size; + return 0; } |