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| author | Artem B. Bityuckiy <dedekind@infradead.org> | 2005-04-05 13:51:58 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@mtd.linutronix.de> | 2005-05-23 13:09:29 +0200 |
| commit | 894214d1a75745a283d5f1921125b3ad36d7ba26 (patch) | |
| tree | 70dd3913dfb671871348878b1f2a4c30427e2d73 /fs/jffs2/wbuf.c | |
| parent | 22c60f5fb7b8184a2d00a607f965b54c586fb40e (diff) | |
| download | op-kernel-dev-894214d1a75745a283d5f1921125b3ad36d7ba26.zip op-kernel-dev-894214d1a75745a283d5f1921125b3ad36d7ba26.tar.gz | |
[JFFS2] Fix race problems with wbuf.
Signed-off-by: Artem B. Bityuckiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'fs/jffs2/wbuf.c')
| -rw-r--r-- | fs/jffs2/wbuf.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c index 0a76768..996d922 100644 --- a/fs/jffs2/wbuf.c +++ b/fs/jffs2/wbuf.c @@ -9,7 +9,7 @@ * * For licensing information, see the file 'LICENCE' in this directory. * - * $Id: wbuf.c,v 1.91 2005/03/18 09:58:06 dedekind Exp $ + * $Id: wbuf.c,v 1.92 2005/04/05 12:51:54 dedekind Exp $ * */ @@ -873,6 +873,7 @@ int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *re return c->mtd->read(c->mtd, ofs, len, retlen, buf); /* Read flash */ + down_read(&c->wbuf_sem); if (jffs2_cleanmarker_oob(c)) ret = c->mtd->read_ecc(c->mtd, ofs, len, retlen, buf, NULL, c->oobinfo); else @@ -896,16 +897,11 @@ int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *re /* if no writebuffer available or write buffer empty, return */ if (!c->wbuf_pagesize || !c->wbuf_len) - return ret;; + goto exit; /* if we read in a different block, return */ if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs)) - return ret; - - /* Lock only if we have reason to believe wbuf contains relevant data, - so that checking an erased block during wbuf recovery space allocation - does not deadlock. */ - down_read(&c->wbuf_sem); + goto exit; if (ofs >= c->wbuf_ofs) { owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */ |
