diff options
author | Christoph Hellwig <hch@infradead.org> | 2008-12-17 17:27:36 (GMT) |
---|---|---|
committer | Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> | 2008-12-22 07:02:01 (GMT) |
commit | efc557570dc99b46e46a7be51c3c7402b485e829 (patch) | |
tree | faba8c63e6bcf798ab76f7da1fcb035ece445700 | |
parent | 9f6c92b9cc2fd41d6c7b493be5637cc5b5659880 (diff) | |
download | linux-fsl-qoriq-efc557570dc99b46e46a7be51c3c7402b485e829.tar.xz |
[XFS] avoid memory allocations in xfs_fs_vcmn_err
xfs_fs_vcmn_err can be called under a spinlock, but does a sleeping memory
allocation to create buffer for it's internal sprintf. Fortunately it's
the only caller of icmn_err, so we can merge the two and have one single
static buffer and spinlock protecting it. While we're at it make sure
we proper __attribute__ format annotations so that the compiler can detect
mismatched format strings.
Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
-rw-r--r-- | fs/xfs/support/debug.c | 37 | ||||
-rw-r--r-- | fs/xfs/support/debug.h | 2 | ||||
-rw-r--r-- | fs/xfs/xfs_error.c | 15 | ||||
-rw-r--r-- | fs/xfs/xfs_error.h | 12 |
4 files changed, 40 insertions, 26 deletions
diff --git a/fs/xfs/support/debug.c b/fs/xfs/support/debug.c index 6361042..ae54829 100644 --- a/fs/xfs/support/debug.c +++ b/fs/xfs/support/debug.c @@ -18,6 +18,13 @@ #include <xfs.h> #include "debug.h" +/* xfs_mount.h drags a lot of crap in, sorry.. */ +#include "xfs_sb.h" +#include "xfs_inum.h" +#include "xfs_ag.h" +#include "xfs_dmapi.h" +#include "xfs_mount.h" + static char message[1024]; /* keep it off the stack */ static DEFINE_SPINLOCK(xfs_err_lock); @@ -55,22 +62,42 @@ cmn_err(register int level, char *fmt, ...) } void -icmn_err(register int level, char *fmt, va_list ap) +xfs_fs_vcmn_err( + int level, + struct xfs_mount *mp, + char *fmt, + va_list ap) { - ulong flags; - int len; + unsigned long flags; + int len = 0; level &= XFS_ERR_MASK; - if(level > XFS_MAX_ERR_LEVEL) + if (level > XFS_MAX_ERR_LEVEL) level = XFS_MAX_ERR_LEVEL; + spin_lock_irqsave(&xfs_err_lock,flags); - len = vsnprintf(message, sizeof(message), fmt, ap); + + if (mp) { + len = sprintf(message, "Filesystem \"%s\": ", mp->m_fsname); + + /* + * Skip the printk if we can't print anything useful + * due to an over-long device name. + */ + if (len >= sizeof(message)) + goto out; + } + + len = vsnprintf(message + len, sizeof(message) - len, fmt, ap); if (len >= sizeof(message)) len = sizeof(message) - 1; if (message[len-1] == '\n') message[len-1] = 0; + printk("%s%s\n", err_level[level], message); + out: spin_unlock_irqrestore(&xfs_err_lock,flags); + BUG_ON(level == CE_PANIC); } diff --git a/fs/xfs/support/debug.h b/fs/xfs/support/debug.h index 75845f9..6f4fd37 100644 --- a/fs/xfs/support/debug.h +++ b/fs/xfs/support/debug.h @@ -27,8 +27,6 @@ #define CE_ALERT 1 /* alert */ #define CE_PANIC 0 /* panic */ -extern void icmn_err(int, char *, va_list) - __attribute__ ((format (printf, 2, 0))); extern void cmn_err(int, char *, ...) __attribute__ ((format (printf, 2, 3))); extern void assfail(char *expr, char *f, int l); diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c index f227ecd..92d5cd5 100644 --- a/fs/xfs/xfs_error.c +++ b/fs/xfs/xfs_error.c @@ -153,21 +153,6 @@ xfs_errortag_clearall(xfs_mount_t *mp, int loud) } #endif /* DEBUG */ -static void -xfs_fs_vcmn_err(int level, xfs_mount_t *mp, char *fmt, va_list ap) -{ - if (mp != NULL) { - char *newfmt; - int len = 16 + mp->m_fsname_len + strlen(fmt); - - newfmt = kmem_alloc(len, KM_SLEEP); - sprintf(newfmt, "Filesystem \"%s\": %s", mp->m_fsname, fmt); - icmn_err(level, newfmt, ap); - kmem_free(newfmt); - } else { - icmn_err(level, fmt, ap); - } -} void xfs_fs_cmn_err(int level, xfs_mount_t *mp, char *fmt, ...) diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h index 11543f1..0c93051 100644 --- a/fs/xfs/xfs_error.h +++ b/fs/xfs/xfs_error.h @@ -159,11 +159,15 @@ extern int xfs_errortag_clearall(xfs_mount_t *mp, int loud); #define XFS_PTAG_FSBLOCK_ZERO 0x00000080 struct xfs_mount; -/* PRINTFLIKE4 */ + +extern void xfs_fs_vcmn_err(int level, struct xfs_mount *mp, + char *fmt, va_list ap) + __attribute__ ((format (printf, 3, 0))); extern void xfs_cmn_err(int panic_tag, int level, struct xfs_mount *mp, - char *fmt, ...); -/* PRINTFLIKE3 */ -extern void xfs_fs_cmn_err(int level, struct xfs_mount *mp, char *fmt, ...); + char *fmt, ...) + __attribute__ ((format (printf, 4, 5))); +extern void xfs_fs_cmn_err(int level, struct xfs_mount *mp, char *fmt, ...) + __attribute__ ((format (printf, 3, 4))); extern void xfs_hex_dump(void *p, int length); |