Subject: [to-be-updated] fat-add-fat_fallocate-operation.patch removed from -mm tree
To: namjae.jeon@xxxxxxxxxxx,a.sahrawat@xxxxxxxxxxx,hirofumi@xxxxxxxxxxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Tue, 07 Jan 2014 15:07:59 -0800
The patch titled
Subject: fat: add fat_fallocate operation
has been removed from the -mm tree. Its filename was
fat-add-fat_fallocate-operation.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Subject: fat: add fat_fallocate operation
Implement preallocation via the fallocate syscall on VFAT partitions.
This patch is based on an earlier patch of the same name which had some
issues detailed below and did not get accepted. Refer
https://lkml.org/lkml/2007/12/22/130.
a) The preallocated space was not persistent when the
FALLOC_FL_KEEP_SIZE flag was set. It will deallocate cluster at evict time.
b) There was no need to zero out the clusters when the flag was set
Instead of doing an expanding truncate, just allocate clusters and add
them to the fat chain. This reduces preallocation time.
Compatibility with windows:
There are no issues when FALLOC_FL_KEEP_SIZE is not set
because it just does an expanding truncate. Thus reading from the
preallocated area on windows returns null until data is written to it.
When a file with preallocated area using the FALLOC_FL_KEEP_SIZE was
written to on windows, the windows driver freed-up the preallocated
clusters and allocated new clusters for the new data. The freed up
clusters gets reflected in the free space available for the partition
which can be seen from the Volume properties.
The windows chkdsk tool also does not report any errors on a
disk containing files with preallocated space.
And there is also no issue using linux fat fsck.
because discard preallocated clusters at repair time.
Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
Cc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fat/file.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++
fs/fat/inode.c | 4 ++
2 files changed, 91 insertions(+)
diff -puN fs/fat/file.c~fat-add-fat_fallocate-operation fs/fat/file.c
--- a/fs/fat/file.c~fat-add-fat_fallocate-operation
+++ a/fs/fat/file.c
@@ -17,8 +17,12 @@
#include <linux/blkdev.h>
#include <linux/fsnotify.h>
#include <linux/security.h>
+#include <linux/falloc.h>
#include "fat.h"
+static long fat_fallocate(struct file *file, int mode,
+ loff_t offset, loff_t len);
+
static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
{
u32 attr;
@@ -182,6 +186,7 @@ const struct file_operations fat_file_op
#endif
.fsync = fat_file_fsync,
.splice_read = generic_file_splice_read,
+ .fallocate = fat_fallocate,
};
static int fat_cont_expand(struct inode *inode, loff_t size)
@@ -220,6 +225,88 @@ out:
return err;
}
+/*
+ * Preallocate space for a file. This implements fat's fallocate file
+ * operation, which gets called from sys_fallocate system call. User
+ * space requests len bytes at offset. If FALLOC_FL_KEEP_SIZE is set
+ * we just allocate clusters without zeroing them out. Otherwise we
+ * allocate and zero out clusters via an expanding truncate.
+ */
+static long fat_fallocate(struct file *file, int mode,
+ loff_t offset, loff_t len)
+{
+ int cluster, fclus, dclus;
+ int nr_cluster; /* Number of clusters to be allocated */
+ loff_t nr_bytes; /* Number of bytes to be allocated*/
+ loff_t free_bytes; /* Unused bytes in the last cluster of file*/
+ struct inode *inode = file->f_mapping->host;
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ int err = 0;
+
+ /* No support for hole punch or other fallocate flags. */
+ if (mode & ~FALLOC_FL_KEEP_SIZE)
+ return -EOPNOTSUPP;
+
+ /* No support for dir */
+ if (!S_ISREG(inode->i_mode))
+ return -EOPNOTSUPP;
+
+ mutex_lock(&inode->i_mutex);
+ if ((offset + len) <= MSDOS_I(inode)->i_disksize)
+ goto error;
+
+ err = inode_newsize_ok(inode, (len + offset));
+ if (err)
+ goto error;
+
+ if (mode & FALLOC_FL_KEEP_SIZE) {
+ /* First compute the number of clusters to be allocated */
+ if (inode->i_size > 0) {
+ err = fat_get_cluster(inode, FAT_ENT_EOF,
+ &fclus, &dclus);
+ if (err < 0) {
+ fat_msg(sb, KERN_ERR,
+ "fat_fallocate(): fat_get_cluster() error");
+ goto error;
+ }
+ free_bytes = ((fclus + 1) << sbi->cluster_bits) -
+ inode->i_size;
+ nr_bytes = offset + len - inode->i_size - free_bytes;
+ } else
+ nr_bytes = offset + len - inode->i_size;
+
+ nr_cluster = (nr_bytes + (sbi->cluster_size - 1)) >>
+ sbi->cluster_bits;
+
+ /* Start the allocation.We are not zeroing out the clusters */
+ while (nr_cluster-- > 0) {
+ err = fat_alloc_clusters(inode, &cluster, 1);
+ if (err) {
+ fat_msg(sb, KERN_ERR,
+ "fat_fallocate(): fat_alloc_clusters() error");
+ goto error;
+ }
+ err = fat_chain_add(inode, cluster, 1);
+ if (err) {
+ fat_free_clusters(inode, cluster);
+ goto error;
+ }
+ MSDOS_I(inode)->i_disksize += sbi->cluster_size;
+ }
+ } else {
+ /* This is just an expanding truncate */
+ err = fat_cont_expand(inode, (offset + len));
+ if (err)
+ fat_msg(sb, KERN_ERR,
+ "fat_fallocate(): fat_cont_expand() error");
+ }
+
+error:
+ mutex_unlock(&inode->i_mutex);
+ return err;
+}
+
/* Free all clusters after the skip'th cluster. */
static int fat_free(struct inode *inode, int skip)
{
diff -puN fs/fat/inode.c~fat-add-fat_fallocate-operation fs/fat/inode.c
--- a/fs/fat/inode.c~fat-add-fat_fallocate-operation
+++ a/fs/fat/inode.c
@@ -497,6 +497,10 @@ static void fat_evict_inode(struct inode
if (!inode->i_nlink) {
inode->i_size = 0;
fat_truncate_blocks(inode, 0);
+ } else {
+ /* Release unwritten fallocated blocks on inode eviction. */
+ if (MSDOS_I(inode)->mmu_private < MSDOS_I(inode)->i_disksize)
+ fat_truncate_blocks(inode, MSDOS_I(inode)->mmu_private);
}
invalidate_inode_buffers(inode);
clear_inode(inode);
_
Patches currently in -mm which might be from namjae.jeon@xxxxxxxxxxx are
fat-zero-out-seek-range-on-_fat_get_block.patch
fat-fallback-to-buffered-write-in-case-of-fallocatded-region-on-direct-io.patch
fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region.patch
linux-next.patch
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