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Christoph Hellwig bd5fe6c5eb fs: kill i_alloc_sem ... i_alloc_sem is a rather special rw_semaphore. It's the last one that may be released by a non-owner, and it's write side is always mirrored by real exclusion. It's intended use it to wait for all pending direct I/O requests to finish before starting a truncate. Replace it with a hand-grown construct: - exclusion for truncates is already guaranteed by i_mutex, so it can simply fall way - the reader side is replaced by an i_dio_count member in struct inode that counts the number of pending direct I/O requests. Truncate can't proceed as long as it's non-zero - when i_dio_count reaches non-zero we wake up a pending truncate using wake_up_bit on a new bit in i_flags - new references to i_dio_count can't appear while we are waiting for it to read zero because the direct I/O count always needs i_mutex (or an equivalent like XFS's i_iolock) for starting a new operation. This scheme is much simpler, and saves the space of a spinlock_t and a struct list_head in struct inode (typically 160 bits on a non-debug 64-bit system). Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>		14 years ago
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Kconfig	…
Makefile	fs: change to new flag variable	14 years ago
aops.c	block: remove per-queue plugging	14 years ago
aops.h	…
attrib.c	Fix common misspellings	14 years ago
attrib.h	…
bitmap.c	…
bitmap.h	…
collate.c	…
collate.h	…
compress.c	Fix common misspellings	14 years ago
debug.c	…
debug.h	…
dir.c	…
dir.h	…
endian.h	…
file.c	fs: kill i_alloc_sem	14 years ago
index.c	…
index.h	…
inode.c	fs: kill i_alloc_sem	14 years ago
inode.h	…
layout.h	Fix common misspellings	14 years ago
lcnalloc.c	…
lcnalloc.h	…
logfile.c	Fix common misspellings	14 years ago
logfile.h	Fix common misspellings	14 years ago
malloc.h	…
mft.c	Fix common misspellings	14 years ago
mft.h	…
mst.c	…
namei.c	…
ntfs.h	…
quota.c	…
quota.h	…
runlist.c	Fix common misspellings	14 years ago
runlist.h	…
super.c	Fix common misspellings	14 years ago
sysctl.c	…
sysctl.h	…
time.h	…
types.h	…
unistr.c	…
upcase.c	…
usnjrnl.c	…
usnjrnl.h	…
volume.h	…