__BLK_END_BIDI_REQUE(9) Block Devices __BLK_END_BIDI_REQUE(9)NAME
__blk_end_bidi_request - Complete a bidi request with queue lock held
SYNOPSIS
bool __blk_end_bidi_request(struct request * rq, int error, unsigned int nr_bytes, unsigned int bidi_bytes);
ARGUMENTS
rq
the request to complete
error
0 for success, < 0 for error
nr_bytes
number of bytes to complete rq
bidi_bytes
number of bytes to complete rq->next_rq
DESCRIPTION
Identical to blk_end_bidi_request except that queue lock is assumed to be locked on entry and remains so on return.
RETURN
false - we are done with this request true - still buffers pending for this request
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 __BLK_END_BIDI_REQUE(9)
Check Out this Related Man Page
VFS_LOCK_FILE(9) The Linux VFS VFS_LOCK_FILE(9)NAME
vfs_lock_file - file byte range lock
SYNOPSIS
int vfs_lock_file(struct file * filp, unsigned int cmd, struct file_lock * fl, struct file_lock * conf);
ARGUMENTS
filp
The file to apply the lock to
cmd
type of locking operation (F_SETLK, F_GETLK, etc.)
fl
The lock to be applied
conf
Place to return a copy of the conflicting lock, if found.
DESCRIPTION
A caller that doesn't care about the conflicting lock may pass NULL as the final argument.
If the filesystem defines a private ->lock method, then conf will be left unchanged; so a caller that cares should initialize it to some
acceptable default.
To avoid blocking kernel daemons, such as lockd, that need to acquire POSIX locks, the ->lock interface may return asynchronously, before
the lock has been granted or denied by the underlying filesystem, if (and only if) fl_grant is set. Callers expecting ->lock to return
asynchronously will only use F_SETLK, not F_SETLKW; they will set FL_SLEEP if (and only if) the request is for a blocking lock. When ->lock
does return asynchronously, it must return FILE_LOCK_DEFERRED, and call ->fl_grant when the lock request completes. If the request is for
non-blocking lock the file system should return FILE_LOCK_DEFERRED then try to get the lock and call the callback routine with the result.
If the request timed out the callback routine will return a nonzero return code and the file system should release the lock. The file
system is also responsible to keep a corresponding posix lock when it grants a lock so the VFS can find out which locks are locally held
and do the correct lock cleanup when required. The underlying filesystem must not drop the kernel lock or call ->fl_grant before returning
to the caller with a FILE_LOCK_DEFERRED return code.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 VFS_LOCK_FILE(9)
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