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| author | Jonathan Corbet <corbet@lwn.net> | 2009-02-06 15:25:24 -0700 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2009-03-16 08:32:27 -0600 |
| commit | db1dd4d376134eba0e08af523b61cc566a4ea1cd (patch) | |
| tree | 8882c673abbaa5713511b7046493fa862b9140d1 /fs/nfsd/vfs.c | |
| parent | 684999149002dd046269666a390458e0acb38280 (diff) | |
| download | lwn-db1dd4d376134eba0e08af523b61cc566a4ea1cd.tar.gz lwn-db1dd4d376134eba0e08af523b61cc566a4ea1cd.zip | |
Use f_lock to protect f_flags
Traditionally, changes to struct file->f_flags have been done under BKL
protection, or with no protection at all. This patch causes all f_flags
changes after file open/creation time to be done under protection of
f_lock. This allows the removal of some BKL usage and fixes a number of
longstanding (if microscopic) races.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'fs/nfsd/vfs.c')
| -rw-r--r-- | fs/nfsd/vfs.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 6e50aaa56ca2..c165a6403df0 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -998,8 +998,11 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, if (!EX_ISSYNC(exp)) stable = 0; - if (stable && !EX_WGATHER(exp)) + if (stable && !EX_WGATHER(exp)) { + spin_lock(&file->f_lock); file->f_flags |= O_SYNC; + spin_unlock(&file->f_lock); + } /* Write the data. */ oldfs = get_fs(); set_fs(KERNEL_DS); |