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author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2008-01-28 23:58:26 -0500 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2008-01-28 23:58:26 -0500 |
commit | 389d1b083c767a360ec84b27a95da06244becec8 (patch) | |
tree | a315c892f615545fd0ce72f7e0d660f5772fb4b2 /fs/buffer.c | |
parent | bb4f397a1a7f2330cb173233599aa159f5780f58 (diff) | |
download | kernel_samsung_smdk4412-389d1b083c767a360ec84b27a95da06244becec8.zip kernel_samsung_smdk4412-389d1b083c767a360ec84b27a95da06244becec8.tar.gz kernel_samsung_smdk4412-389d1b083c767a360ec84b27a95da06244becec8.tar.bz2 |
Add buffer head related helper functions
Add buffer head related helper function bh_uptodate_or_lock and
bh_submit_read which can be used by file system
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Diffstat (limited to 'fs/buffer.c')
-rw-r--r-- | fs/buffer.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 7249e01..456c9ab 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -3213,6 +3213,50 @@ static int buffer_cpu_notify(struct notifier_block *self, return NOTIFY_OK; } +/** + * bh_uptodate_or_lock: Test whether the buffer is uptodate + * @bh: struct buffer_head + * + * Return true if the buffer is up-to-date and false, + * with the buffer locked, if not. + */ +int bh_uptodate_or_lock(struct buffer_head *bh) +{ + if (!buffer_uptodate(bh)) { + lock_buffer(bh); + if (!buffer_uptodate(bh)) + return 0; + unlock_buffer(bh); + } + return 1; +} +EXPORT_SYMBOL(bh_uptodate_or_lock); + +/** + * bh_submit_read: Submit a locked buffer for reading + * @bh: struct buffer_head + * + * Returns zero on success and -EIO on error. + */ +int bh_submit_read(struct buffer_head *bh) +{ + BUG_ON(!buffer_locked(bh)); + + if (buffer_uptodate(bh)) { + unlock_buffer(bh); + return 0; + } + + get_bh(bh); + bh->b_end_io = end_buffer_read_sync; + submit_bh(READ, bh); + wait_on_buffer(bh); + if (buffer_uptodate(bh)) + return 0; + return -EIO; +} +EXPORT_SYMBOL(bh_submit_read); + void __init buffer_init(void) { int nrpages; |