--- /dev/null
+A large part of this code is from the generic VFS code in fs/ioctl.c in the
+upstream kernel.
+
+Index: linux-2.6.18-53.1.14/fs/ext3/ioctl.c
+===================================================================
+--- linux-2.6.18-53.1.14.orig/fs/ext3/ioctl.c
++++ linux-2.6.18-53.1.14/fs/ext3/ioctl.c
+@@ -15,7 +15,159 @@
+ #include <linux/time.h>
+ #include <asm/uaccess.h>
+ #include <linux/namei.h>
++#include "fiemap.h"
+
++/* So that the fiemap access checks can't overflow on 32 bit machines. */
++#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
++
++/**
++ * fiemap_fill_next_extent - Fiemap helper function
++ * @fieinfo: Fiemap context passed into ->fiemap
++ * @logical: Extent logical start offset, in bytes
++ * @phys: Extent physical start offset, in bytes
++ * @len: Extent length, in bytes
++ * @flags: FIEMAP_EXTENT flags that describe this extent
++ * @lun: LUN on which this extent resides
++ *
++ * Called from file system ->fiemap callback. Will populate extent
++ * info as passed in via arguments and copy to user memory. On
++ * success, extent count on fieinfo is incremented.
++ *
++ * Returns 0 on success, -errno on error, 1 if this was the last
++ * extent that will fit in user array.
++ */
++#define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC)
++#define SET_NO_DIRECT_FLAGS (FIEMAP_EXTENT_DATA_COMPRESSED \
++ |FIEMAP_EXTENT_DATA_ENCRYPTED \
++ |FIEMAP_EXTENT_NET)
++#define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
++int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
++ u64 phys, u64 len, u32 flags, dev_t dev)
++{
++ struct fiemap_extent extent = { 0 };
++ struct fiemap_extent *dest = fieinfo->fi_extents_start;
++
++ /* only count the extents */
++ if (fieinfo->fi_extents_max == 0) {
++ fieinfo->fi_extents_mapped++;
++ return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
++ }
++
++ if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
++ return 1;
++
++ if (flags & SET_UNKNOWN_FLAGS)
++ flags |= FIEMAP_EXTENT_UNKNOWN;
++ if (flags & SET_NO_DIRECT_FLAGS)
++ flags |= FIEMAP_EXTENT_NO_DIRECT;
++ if (flags & SET_NOT_ALIGNED_FLAGS)
++ flags |= FIEMAP_EXTENT_NOT_ALIGNED;
++
++ extent.fe_logical = logical;
++ extent.fe_physical = phys;
++ extent.fe_length = len;
++ extent.fe_flags = flags;
++ extent.fe_device = new_encode_dev(dev);
++
++ dest += fieinfo->fi_extents_mapped;
++ if (copy_to_user(dest, &extent, sizeof(extent)))
++ return -EFAULT;
++
++ fieinfo->fi_extents_mapped++;
++ if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
++ return 1;
++
++ return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
++}
++
++static int fiemap_check_ranges(struct super_block *sb,
++ u64 start, u64 len, u64 *new_len)
++{
++ *new_len = len;
++
++ if (len == 0)
++ return -EINVAL;
++
++ if (start > sb->s_maxbytes)
++ return -EFBIG;
++
++ /*
++ * Shrink request scope to what the fs can actually handle.
++ */
++ if ((len > sb->s_maxbytes) ||
++ (sb->s_maxbytes - len) < start)
++ *new_len = sb->s_maxbytes - start;
++
++ return 0;
++}
++
++/*
++ * fiemap_check_flags - check validity of requested flags for fiemap
++ * @fieinfo: Fiemap context passed into ->fiemap
++ * @fs_flags: Set of fiemap flags that the file system understands
++ *
++ * Called from file system ->fiemap callback. This will compute the
++ * intersection of valid fiemap flags and those that the fs supports. That
++ * value is then compared against the user supplied flags. In case of bad user
++ * flags, the invalid values will be written into the fieinfo structure, and
++ * -EBADR is returned, which tells ioctl_fiemap() to return those values to
++ * userspace. For this reason, a return code of -EBADR should be preserved.
++ *
++ * Returns 0 on success, -EBADR on bad flags.
++*/
++int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
++{
++ u32 incompat_flags;
++
++ incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
++ if (incompat_flags) {
++ fieinfo->fi_flags = incompat_flags;
++ return -EBADR;
++ }
++
++ return 0;
++}
++
++int ioctl_fiemap(struct inode *inode, struct file *filp, unsigned long arg)
++{
++ struct fiemap fiemap;
++ u64 len;
++ struct fiemap_extent_info fieinfo = {0, };
++ struct super_block *sb = inode->i_sb;
++ int error = 0;
++
++ if (copy_from_user(&fiemap, (struct fiemap __user *) arg,
++ sizeof(struct fiemap)))
++ return -EFAULT;
++
++ if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
++ return -EINVAL;
++
++ error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
++ &len);
++ if (error)
++ return error;
++
++ fieinfo.fi_flags = fiemap.fm_flags;
++ fieinfo.fi_extents_max = fiemap.fm_extent_count;
++ fieinfo.fi_extents_start = (struct fiemap_extent *)(arg + sizeof(fiemap));
++
++ if (fiemap.fm_extent_count != 0 &&
++ !access_ok(VERIFY_WRITE, (void *)arg,
++ offsetof(typeof(fiemap), fm_extents[fiemap.fm_extent_count])))
++ return -EFAULT;
++
++ if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
++ filemap_write_and_wait(inode->i_mapping);
++
++ error = ext3_fiemap(inode, &fieinfo, fiemap.fm_start, len);
++ fiemap.fm_flags = fieinfo.fi_flags;
++ fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
++ if (copy_to_user((char *)arg, &fiemap, sizeof(fiemap)))
++ error = -EFAULT;
++
++ return error;
++}
+
+ int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
+ unsigned long arg)
+@@ -272,7 +424,9 @@ flags_err:
+
+ return err;
+ }
+-
++ case EXT3_IOC_FIEMAP: {
++ return ioctl_fiemap(inode, filp, arg);
++ }
+
+ default:
+ return -ENOTTY;
+Index: linux-2.6.18-53.1.14/include/linux/ext3_fs.h
+===================================================================
+--- linux-2.6.18-53.1.14.orig/include/linux/ext3_fs.h
++++ linux-2.6.18-53.1.14/include/linux/ext3_fs.h
+@@ -257,15 +257,19 @@ struct ext3_new_group_data {
+ #define EXT3_IOC_SETFLAGS _IOW('f', 2, long)
+ #define EXT3_IOC_GETVERSION _IOR('f', 3, long)
+ #define EXT3_IOC_SETVERSION _IOW('f', 4, long)
++#define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
++#define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
+ #define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
+ #define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input)
++#define EXT3_IOC_FIEMAP _IOWR('f', 10, struct fiemap)
+ #define EXT3_IOC_GETVERSION_OLD _IOR('v', 1, long)
+ #define EXT3_IOC_SETVERSION_OLD _IOW('v', 2, long)
+ #ifdef CONFIG_JBD_DEBUG
+ #define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
+ #endif
+-#define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
+-#define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
++
++/* FIEMAP flags supported by ext3 */
++#define EXT3_FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC)
+
+ /*
+ * Mount options
+@@ -1040,6 +1044,9 @@ extern int ext3_block_truncate_page(hand
+ /* ioctl.c */
+ extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
+ unsigned long);
++struct fiemap_extent_info;
++extern int ext3_fiemap(struct inode *, struct fiemap_extent_info *, __u64,
++ __u64);
+
+ /* namei.c */
+ extern int ext3_orphan_add(handle_t *, struct inode *);
+@@ -1117,7 +1124,6 @@ ext3_get_blocks_wrap(handle_t *handle, s
+ return ret;
+ }
+
+-
+ #endif /* __KERNEL__ */
+
+ /* EXT3_IOC_CREATE_INUM at bottom of file (visible to kernel and user). */
+Index: linux-2.6.18-53.1.14/include/linux/ext3_extents.h
+===================================================================
+--- linux-2.6.18-53.1.14.orig/include/linux/ext3_extents.h
++++ linux-2.6.18-53.1.14/include/linux/ext3_extents.h
+@@ -142,8 +142,10 @@ struct ext3_ext_path {
+ * callback must return valid extent (passed or newly created)
+ */
+ typedef int (*ext_prepare_callback)(struct inode *, struct ext3_ext_path *,
+- struct ext3_ext_cache *,
+- void *);
++ struct ext3_ext_cache *,
++ struct ext3_extent *, void *);
++
++#define HAVE_EXT_PREPARE_CB_EXTENT
+
+ #define EXT_CONTINUE 0
+ #define EXT_BREAK 1
+@@ -152,6 +154,26 @@ typedef int (*ext_prepare_callback)(stru
+
+ #define EXT_MAX_BLOCK 0xffffffff
+
++/*
++ * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an
++ * initialized extent. This is 2^15 and not (2^16 - 1), since we use the
++ * MSB of ee_len field in the extent datastructure to signify if this
++ * particular extent is an initialized extent or an uninitialized (i.e.
++ * preallocated).
++ * EXT_UNINIT_MAX_LEN is the maximum number of blocks we can have in an
++ * uninitialized extent.
++ * If ee_len is <= 0x8000, it is an initialized extent. Otherwise, it is an
++ * uninitialized one. In other words, if MSB of ee_len is set, it is an
++ * uninitialized extent with only one special scenario when ee_len = 0x8000.
++ * In this case we can not have an uninitialized extent of zero length and
++ * thus we make it as a special case of initialized extent with 0x8000 length.
++ * This way we get better extent-to-group alignment for initialized extents.
++ * Hence, the maximum number of blocks we can have in an *initialized*
++ * extent is 2^15 (32768) and in an *uninitialized* extent is 2^15-1 (32767).
++ */
++#define EXT_INIT_MAX_LEN (1UL << 15)
++#define EXT_UNINIT_MAX_LEN (EXT_INIT_MAX_LEN - 1)
++
+ #define EXT_FLAGS_CLR_UNKNOWN 0x7 /* Flags cleared on modification */
+ #define EXT_HDR_GEN_BITS 24
+ #define EXT_HDR_GEN_MASK ((1 << EXT_HDR_GEN_BITS) - 1)
+@@ -219,6 +241,12 @@ ext3_ext_invalidate_cache(struct inode *
+ EXT3_I(inode)->i_cached_extent.ec_type = EXT3_EXT_CACHE_NO;
+ }
+
++static inline int ext3_ext_is_uninitialized(struct ext3_extent *ext)
++{
++ /* Extent with ee_len of 0x8000 is treated as an initialized extent */
++ return (le16_to_cpu(ext->ee_len) > EXT_INIT_MAX_LEN);
++}
++
+ extern int ext3_ext_search_left(struct inode *, struct ext3_ext_path *, unsigned long *, unsigned long *);
+ extern int ext3_ext_search_right(struct inode *, struct ext3_ext_path *, unsigned long *, unsigned long *);
+ extern int ext3_extent_tree_init(handle_t *, struct inode *);
+Index: linux-2.6.18-53.1.14/fs/ext3/extents.c
+===================================================================
+--- linux-2.6.18-53.1.14.orig/fs/ext3/extents.c
++++ linux-2.6.18-53.1.14/fs/ext3/extents.c
+@@ -41,6 +41,7 @@
+ #include <linux/string.h>
+ #include <linux/slab.h>
+ #include <linux/ext3_extents.h>
++#include "fiemap.h"
+ #include <asm/uaccess.h>
+
+
+@@ -1481,7 +1482,7 @@ int ext3_ext_walk_space(struct inode *in
+ }
+
+ BUG_ON(cbex.ec_len == 0);
+- err = func(inode, path, &cbex, cbdata);
++ err = func(inode, path, &cbex, ex, cbdata);
+ ext3_ext_drop_refs(path);
+
+ if (err < 0)
+@@ -2296,6 +2297,103 @@ int ext3_ext_writepage_trans_blocks(stru
+ return needed;
+ }
+
++/*
++ * Callback function called for each extent to gather FIEMAP information.
++ */
++int ext3_ext_fiemap_cb(struct inode *inode, struct ext3_ext_path *path,
++ struct ext3_ext_cache *newex, struct ext3_extent *ex,
++ void *data)
++{
++ struct fiemap_extent_info *fieinfo = data;
++ unsigned long blksize_bits = inode->i_sb->s_blocksize_bits;
++ __u64 logical;
++ __u64 physical;
++ __u64 length;
++ __u32 flags = 0;
++ int error;
++
++ logical = (__u64)newex->ec_block << blksize_bits;
++
++ if (newex->ec_type == EXT3_EXT_CACHE_GAP) {
++ pgoff_t offset;
++ struct page *page;
++ struct buffer_head *bh = NULL;
++
++ offset = logical >> PAGE_SHIFT;
++ page = find_get_page(inode->i_mapping, offset);
++ if (!page || !page_has_buffers(page))
++ return EXT_CONTINUE;
++
++ bh = page_buffers(page);
++
++ if (!bh)
++ return EXT_CONTINUE;
++
++ if (buffer_delay(bh)) {
++ flags |= FIEMAP_EXTENT_DELALLOC;
++ page_cache_release(page);
++ } else {
++ page_cache_release(page);
++ return EXT_CONTINUE;
++ }
++ }
++
++ physical = (__u64)newex->ec_start << blksize_bits;
++ length = (__u64)newex->ec_len << blksize_bits;
++
++ if (ex && ext3_ext_is_uninitialized(ex))
++ flags |= FIEMAP_EXTENT_UNWRITTEN;
++
++ /*
++ * If this extent reaches EXT_MAX_BLOCK, it must be last.
++ *
++ * Or if ext3_ext_next_allocated_block is EXT_MAX_BLOCK,
++ * this indicates no more allocated blocks.
++ *
++ * XXX this might miss a single-block extent at EXT_MAX_BLOCK
++ */
++ if (logical + length - 1 == EXT_MAX_BLOCK ||
++ ext3_ext_next_allocated_block(path) == EXT_MAX_BLOCK)
++ flags |= FIEMAP_EXTENT_LAST;
++
++ error = fiemap_fill_next_extent(fieinfo, logical, physical,
++ length, flags, inode->i_sb->s_dev);
++ if (error < 0)
++ return error;
++ if (error == 1)
++ return EXT_BREAK;
++
++ return EXT_CONTINUE;
++}
++
++int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
++ __u64 start, __u64 len)
++{
++ ext3_fsblk_t start_blk;
++ ext3_fsblk_t len_blks;
++ int error = 0;
++
++ if (!(EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL))
++ return -EOPNOTSUPP;
++
++ if (fiemap_check_flags(fieinfo, EXT3_FIEMAP_FLAGS_COMPAT))
++ return -EBADR;
++
++ start_blk = start >> inode->i_sb->s_blocksize_bits;
++ len_blks = (len + inode->i_sb->s_blocksize) >> inode->i_sb->s_blocksize_bits;
++
++ /*
++ * Walk the extent tree gathering extent information.
++ * ext3_ext_fiemap_cb will push extents back to user.
++ */
++ mutex_lock(&EXT3_I(inode)->truncate_mutex);
++ error = ext3_ext_walk_space(inode, start_blk, len_blks,
++ ext3_ext_fiemap_cb, fieinfo);
++ mutex_unlock(&EXT3_I(inode)->truncate_mutex);
++
++ return error;
++}
++
+ EXPORT_SYMBOL(ext3_mark_inode_dirty);
+ EXPORT_SYMBOL(ext3_ext_invalidate_cache);
+ EXPORT_SYMBOL(ext3_ext_insert_extent);
+Index: linux-2.6.18-53.1.14/fs/ext3/fiemap.h
+===================================================================
+--- /dev/null
++++ linux-2.6.18-53.1.14/fs/ext3/fiemap.h
+@@ -0,0 +1,84 @@
++/*
++ * FIEMAP ioctl infrastructure.
++ *
++ * Copyright (C) 2007 Cluster File Systems, Inc
++ *
++ * Author: Kalpak Shah <kalpak.shah@sun.com>
++ * Andreas Dilger <adilger@sun.com>
++ */
++
++#ifndef _LINUX_EXT3_FIEMAP_H
++#define _LINUX_EXT3_FIEMAP_H
++
++struct fiemap_extent {
++ __u64 fe_logical; /* logical offset in bytes for the start of
++ * the extent from the beginning of the file */
++ __u64 fe_physical; /* physical offset in bytes for the start
++ * of the extent from the beginning of the disk */
++ __u64 fe_length; /* length in bytes for this extent */
++ __u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */
++ __u32 fe_device; /* device number for this extent */
++};
++
++struct fiemap {
++ __u64 fm_start; /* logical offset (inclusive) at
++ * which to start mapping (in) */
++ __u64 fm_length; /* logical length of mapping which
++ * userspace wants (in) */
++ __u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */
++ __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
++ __u32 fm_extent_count; /* size of fm_extents array (in) */
++ __u32 fm_reserved;
++ struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
++};
++
++/*
++ * FIEMAP helper definition.
++ */
++struct fiemap_extent_info {
++ unsigned int fi_flags; /* Flags as passed from user */
++ unsigned int fi_extents_mapped; /* Number of mapped extents */
++ unsigned int fi_extents_max; /* Size of fiemap_extent array*/
++ struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent array */
++};
++
++int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
++int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
++ u64 phys, u64 len, u32 flags, u32 lun);
++
++#define FIEMAP_MAX_OFFSET (~0ULL)
++
++#define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before map */
++#define FIEMAP_FLAG_XATTR 0x00000002 /* map extended attribute tree */
++
++/* ldiskfs only supports FLAG_SYNC flag currently */
++#define FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
++
++
++#define FIEMAP_EXTENT_LAST 0x00000001 /* Last extent in file. */
++#define FIEMAP_EXTENT_UNKNOWN 0x00000002 /* Data location unknown. */
++#define FIEMAP_EXTENT_DELALLOC 0x00000004 /* Location still pending.
++ * Sets EXTENT_UNKNOWN. */
++#define FIEMAP_EXTENT_NO_DIRECT 0x00000008 /* Data mapping undefined */
++#define FIEMAP_EXTENT_SECONDARY 0x00000010 /* Data copied offline. May
++ * set EXTENT_NO_DIRECT. */
++#define FIEMAP_EXTENT_NET 0x00000020 /* Data stored remotely.
++ * Sets EXTENT_NO_DIRECT. */
++#define FIEMAP_EXTENT_DATA_COMPRESSED 0x00000040 /* Data is compressed by fs.
++ * Sets EXTENT_NO_DIRECT. */
++#define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs.
++ * Sets EXTENT_NO_DIRECT. */
++#define FIEMAP_EXTENT_NOT_ALIGNED 0x00000100 /* Extent offsets may not be
++ * block aligned. */
++#define FIEMAP_EXTENT_DATA_INLINE 0x00000200 /* Data mixed with metadata.
++ * Sets EXTENT_NOT_ALIGNED.*/
++#define FIEMAP_EXTENT_DATA_TAIL 0x00000400 /* Multiple files in block.
++ * Sets EXTENT_NOT_ALIGNED.*/
++#define FIEMAP_EXTENT_UNWRITTEN 0x00000800 /* Space allocated, but
++ * no data (i.e. zero). */
++#define FIEMAP_EXTENT_MERGED 0x00001000 /* File does not natively
++ * support extents. Result
++ * merged for efficiency. */
++
++#endif /* _LINUX_EXT3_FIEMAP_H */
++
+
git://git.whamcloud.com / fs / lustre-release.git / blobdiff