diff options
author | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-21 08:52:18 -0800 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-21 08:52:18 -0800 |
commit | b05005772f34497eb2b7415a651fe785cbe70e16 (patch) | |
tree | b176aeb7fa9baf69e77ddd83e844727490bfcf28 /fs/direct-io.c | |
parent | 044f324f6ea5d55391db62fca6a295b2651cb946 (diff) | |
parent | 7705a8792b0fc82fd7d4dd923724606bbfd9fb20 (diff) | |
download | linux-b05005772f34497eb2b7415a651fe785cbe70e16.tar.bz2 |
Merge branch 'origin'
Conflicts:
Documentation/video4linux/CARDLIST.cx88
drivers/media/video/cx88/Kconfig
drivers/media/video/em28xx/em28xx-video.c
drivers/media/video/saa7134/saa7134-dvb.c
Resolved as in the original merge by Mauro Carvalho Chehab
Diffstat (limited to 'fs/direct-io.c')
-rw-r--r-- | fs/direct-io.c | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c index 30dbbd1df511..27f3e787faca 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -857,6 +857,7 @@ do_holes: /* Handle holes */ if (!buffer_mapped(map_bh)) { char *kaddr; + loff_t i_size_aligned; /* AKPM: eargh, -ENOTBLK is a hack */ if (dio->rw == WRITE) { @@ -864,8 +865,14 @@ do_holes: return -ENOTBLK; } + /* + * Be sure to account for a partial block as the + * last block in the file + */ + i_size_aligned = ALIGN(i_size_read(dio->inode), + 1 << blkbits); if (dio->block_in_file >= - i_size_read(dio->inode)>>blkbits) { + i_size_aligned >> blkbits) { /* We hit eof */ page_cache_release(page); goto out; @@ -1148,15 +1155,16 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode, * For writes, i_mutex is not held on entry; it is never taken. * * DIO_LOCKING (simple locking for regular files) - * For writes we are called under i_mutex and return with i_mutex held, even though - * it is internally dropped. + * For writes we are called under i_mutex and return with i_mutex held, even + * though it is internally dropped. * For reads, i_mutex is not held on entry, but it is taken and dropped before * returning. * * DIO_OWN_LOCKING (filesystem provides synchronisation and handling of * uninitialised data, allowing parallel direct readers and writers) * For writes we are called without i_mutex, return without it, never touch it. - * For reads, i_mutex is held on entry and will be released before returning. + * For reads we are called under i_mutex and return with i_mutex held, even + * though it may be internally dropped. * * Additional i_alloc_sem locking requirements described inline below. */ @@ -1175,7 +1183,8 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, ssize_t retval = -EINVAL; loff_t end = offset; struct dio *dio; - int reader_with_isem = (rw == READ && dio_lock_type == DIO_OWN_LOCKING); + int release_i_mutex = 0; + int acquire_i_mutex = 0; if (rw & WRITE) current->flags |= PF_SYNCWRITE; @@ -1218,7 +1227,6 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, * writers need to grab i_alloc_sem only (i_mutex is already held) * For regular files using DIO_OWN_LOCKING, * neither readers nor writers take any locks here - * (i_mutex is already held and release for writers here) */ dio->lock_type = dio_lock_type; if (dio_lock_type != DIO_NO_LOCKING) { @@ -1229,7 +1237,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, mapping = iocb->ki_filp->f_mapping; if (dio_lock_type != DIO_OWN_LOCKING) { mutex_lock(&inode->i_mutex); - reader_with_isem = 1; + release_i_mutex = 1; } retval = filemap_write_and_wait_range(mapping, offset, @@ -1241,7 +1249,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, if (dio_lock_type == DIO_OWN_LOCKING) { mutex_unlock(&inode->i_mutex); - reader_with_isem = 0; + acquire_i_mutex = 1; } } @@ -1262,11 +1270,13 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, nr_segs, blkbits, get_blocks, end_io, dio); if (rw == READ && dio_lock_type == DIO_LOCKING) - reader_with_isem = 0; + release_i_mutex = 0; out: - if (reader_with_isem) + if (release_i_mutex) mutex_unlock(&inode->i_mutex); + else if (acquire_i_mutex) + mutex_lock(&inode->i_mutex); if (rw & WRITE) current->flags &= ~PF_SYNCWRITE; return retval; |