/**
* vxfs_immed_follow_link - follow immed symlink
* @dp: dentry for the link
* @np: pathname lookup data for the current path walk
*
* Description:
* vxfs_immed_follow_link restarts the pathname lookup with
* the data obtained from @dp.
*
* Returns:
* Zero on success, else a negative error code.
*/
static void *
vxfs_immed_follow_link(struct dentry *dp, struct nameidata *np)
{
struct vxfs_inode_info *vip = VXFS_INO(d_inode(dp));
nd_set_link(np, vip->vii_immed.vi_immed);
return NULL;
}
/**
* vxfs_immed_follow_link - follow immed symlink
* @dp: dentry for the link
* @np: pathname lookup data for the current path walk
*
* Description:
* vxfs_immed_follow_link restarts the pathname lookup with
* the data obtained from @dp.
*
* Returns:
* Zero on success, else a negative error code.
*/
static int
vxfs_immed_follow_link(struct dentry *dp, struct nameidata *np)
{
struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode);
return (vfs_follow_link(np, vip->vii_immed.vi_immed));
}
/**
* vxfs_immed_readlink - read immed symlink
* @dp: dentry for the link
* @bp: output buffer
* @buflen: length of @bp
*
* Description:
* vxfs_immed_readlink calls vfs_readlink to read the link
* described by @dp into userspace.
*
* Returns:
* Number of bytes successfully copied to userspace.
*/
static int
vxfs_immed_readlink(struct dentry *dp, char *bp, int buflen)
{
struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode);
return (vfs_readlink(dp, bp, buflen, vip->vii_immed.vi_immed));
}
/**
* vxfs_immed_readpage - read part of an immed inode into pagecache
* @file: file context (unused)
* @page: page frame to fill in.
*
* Description:
* vxfs_immed_readpage reads a part of the immed area of the
* file that hosts @pp into the pagecache.
*
* Returns:
* Zero on success, else a negative error code.
*
* Locking status:
* @page is locked and will be unlocked.
*/
static int
vxfs_immed_readpage(struct file *fp, struct page *pp)
{
struct vxfs_inode_info *vip = VXFS_INO(pp->mapping->host);
u_int64_t offset = (u_int64_t)pp->index << PAGE_CACHE_SHIFT;
caddr_t kaddr;
kaddr = kmap(pp);
memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE);
kunmap(pp);
flush_dcache_page(pp);
SetPageUptodate(pp);
unlock_page(pp);
return 0;
}
/**
* vxfs_readdir - read a directory
* @fp: the directory to read
* @retp: return buffer
* @filler: filldir callback
*
* Description:
* vxfs_readdir fills @retp with directory entries from @fp
* using the VFS supplied callback @filler.
*
* Returns:
* Zero.
*/
static int
vxfs_readdir(struct file *fp, struct dir_context *ctx)
{
struct inode *ip = file_inode(fp);
struct super_block *sbp = ip->i_sb;
u_long bsize = sbp->s_blocksize;
loff_t pos, limit;
struct vxfs_sb_info *sbi = VXFS_SBI(sbp);
if (ctx->pos == 0) {
if (!dir_emit_dot(fp, ctx))
goto out;
ctx->pos++;
}
if (ctx->pos == 1) {
if (!dir_emit(ctx, "..", 2, VXFS_INO(ip)->vii_dotdot, DT_DIR))
goto out;
ctx->pos++;
}
limit = VXFS_DIRROUND(ip->i_size);
if (ctx->pos > limit)
goto out;
pos = ctx->pos & ~3L;
while (pos < limit) {
struct page *pp;
char *kaddr;
int pg_ofs = pos & ~PAGE_MASK;
int rc = 0;
pp = vxfs_get_page(ip->i_mapping, pos >> PAGE_SHIFT);
if (IS_ERR(pp))
return -ENOMEM;
kaddr = (char *)page_address(pp);
while (pg_ofs < PAGE_SIZE && pos < limit) {
struct vxfs_direct *de;
if ((pos & (bsize - 1)) < 4) {
struct vxfs_dirblk *dbp =
(struct vxfs_dirblk *)
(kaddr + (pos & ~PAGE_MASK));
int overhead = VXFS_DIRBLKOV(sbi, dbp);
pos += overhead;
pg_ofs += overhead;
}
de = (struct vxfs_direct *)(kaddr + pg_ofs);
if (!de->d_reclen) {
pos += bsize - 1;
pos &= ~(bsize - 1);
break;
}
pg_ofs += fs16_to_cpu(sbi, de->d_reclen);
pos += fs16_to_cpu(sbi, de->d_reclen);
if (!de->d_ino)
continue;
rc = dir_emit(ctx, de->d_name,
fs16_to_cpu(sbi, de->d_namelen),
fs32_to_cpu(sbi, de->d_ino),
DT_UNKNOWN);
if (!rc) {
/* the dir entry was not read, fix pos. */
pos -= fs16_to_cpu(sbi, de->d_reclen);
break;
}
}
vxfs_put_page(pp);
if (!rc)
break;
}
ctx->pos = pos | 2;
out:
return 0;
}
/**
* vxfs_read_fshead - read the fileset headers
* @sbp: superblock to which the fileset belongs
*
* Description:
* vxfs_read_fshead will fill the inode and structural inode list in @sb.
*
* Returns:
* Zero on success, else a negative error code (-EINVAL).
*/
int
vxfs_read_fshead(struct super_block *sbp)
{
struct vxfs_sb_info *infp = VXFS_SBI(sbp);
struct vxfs_fsh *pfp, *sfp;
struct vxfs_inode_info *vip, *tip;
if (!(vip = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino))) {
printk(KERN_ERR "vxfs: unabled to read fsh inode\n");
return -EINVAL;
} else if (!VXFS_ISFSH(vip)) {
printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
vip->vii_mode & VXFS_TYPE_MASK);
return -EINVAL;
}
#ifdef DIAGNOSTIC
printk("vxfs: fsh inode dump:\n");
vxfs_dumpi(vip, infp->vsi_fshino);
#endif
if (!(infp->vsi_fship = vxfs_get_fake_inode(sbp, vip))) {
printk(KERN_ERR "vxfs: unabled to get fsh inode\n");
return -EINVAL;
}
if (!(sfp = vxfs_getfsh(infp->vsi_fship, 0))) {
printk(KERN_ERR "vxfs: unabled to get structural fsh\n");
return -EINVAL;
}
#ifdef DIAGNOSTIC
vxfs_dumpfsh(sfp);
#endif
if (!(pfp = vxfs_getfsh(infp->vsi_fship, 1))) {
printk(KERN_ERR "vxfs: unabled to get primary fsh\n");
return -EINVAL;
}
#ifdef DIAGNOSTIC
vxfs_dumpfsh(pfp);
#endif
tip = vxfs_blkiget(sbp, infp->vsi_iext, sfp->fsh_ilistino[0]);
if (!tip || ((infp->vsi_stilist = vxfs_get_fake_inode(sbp, tip)) == NULL)) {
printk(KERN_ERR "vxfs: unabled to get structual list inode\n");
return -EINVAL;
} else if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
printk(KERN_ERR "vxfs: structual list inode is of wrong type (%x)\n",
VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK);
return -EINVAL;
}
tip = vxfs_stiget(sbp, pfp->fsh_ilistino[0]);
if (!tip || ((infp->vsi_ilist = vxfs_get_fake_inode(sbp, tip)) == NULL)) {
printk(KERN_ERR "vxfs: unabled to get inode list inode\n");
return -EINVAL;
} else if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
return -EINVAL;
}
return 0;
}
/**
* vxfs_read_fshead - read the fileset headers
* @sbp: superblock to which the fileset belongs
*
* Description:
* vxfs_read_fshead will fill the inode and structural inode list in @sb.
*
* Returns:
* Zero on success, else a negative error code (-EINVAL).
*/
int
vxfs_read_fshead(struct super_block *sbp)
{
struct vxfs_sb_info *infp = VXFS_SBI(sbp);
struct vxfs_fsh *pfp, *sfp;
struct vxfs_inode_info *vip, *tip;
vip = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino);
if (!vip) {
printk(KERN_ERR "vxfs: unable to read fsh inode\n");
return -EINVAL;
}
if (!VXFS_ISFSH(vip)) {
printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
vip->vii_mode & VXFS_TYPE_MASK);
goto out_free_fship;
}
#ifdef DIAGNOSTIC
printk(KERN_INFO "vxfs: fsh inode dump:\n");
vxfs_dumpi(vip, infp->vsi_fshino);
#endif
infp->vsi_fship = vxfs_get_fake_inode(sbp, vip);
if (!infp->vsi_fship) {
printk(KERN_ERR "vxfs: unable to get fsh inode\n");
goto out_free_fship;
}
sfp = vxfs_getfsh(infp->vsi_fship, 0);
if (!sfp) {
printk(KERN_ERR "vxfs: unable to get structural fsh\n");
goto out_iput_fship;
}
#ifdef DIAGNOSTIC
vxfs_dumpfsh(sfp);
#endif
pfp = vxfs_getfsh(infp->vsi_fship, 1);
if (!pfp) {
printk(KERN_ERR "vxfs: unable to get primary fsh\n");
goto out_free_sfp;
}
#ifdef DIAGNOSTIC
vxfs_dumpfsh(pfp);
#endif
tip = vxfs_blkiget(sbp, infp->vsi_iext, sfp->fsh_ilistino[0]);
if (!tip)
goto out_free_pfp;
infp->vsi_stilist = vxfs_get_fake_inode(sbp, tip);
if (!infp->vsi_stilist) {
printk(KERN_ERR "vxfs: unable to get structural list inode\n");
kfree(tip);
goto out_free_pfp;
}
if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
printk(KERN_ERR "vxfs: structual list inode is of wrong type (%x)\n",
VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK);
goto out_iput_stilist;
}
tip = vxfs_stiget(sbp, pfp->fsh_ilistino[0]);
if (!tip)
goto out_iput_stilist;
infp->vsi_ilist = vxfs_get_fake_inode(sbp, tip);
if (!infp->vsi_ilist) {
printk(KERN_ERR "vxfs: unable to get inode list inode\n");
kfree(tip);
goto out_iput_stilist;
}
if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
goto out_iput_ilist;
}
return 0;
out_iput_ilist:
iput(infp->vsi_ilist);
out_iput_stilist:
iput(infp->vsi_stilist);
out_free_pfp:
kfree(pfp);
out_free_sfp:
kfree(sfp);
out_iput_fship:
iput(infp->vsi_fship);
return -EINVAL;
out_free_fship:
kfree(vip);
return -EINVAL;
}
/**
* vxfs_readdir - read a directory
* @fp: the directory to read
* @retp: return buffer
* @filler: filldir callback
*
* Description:
* vxfs_readdir fills @retp with directory entries from @fp
* using the VFS supplied callback @filler.
*
* Returns:
* Zero.
*/
static int
vxfs_readdir(struct file *fp, void *retp, filldir_t filler)
{
struct inode *ip = fp->f_path.dentry->d_inode;
struct super_block *sbp = ip->i_sb;
u_long bsize = sbp->s_blocksize;
u_long page, npages, block, pblocks, nblocks, offset;
loff_t pos;
switch ((long)fp->f_pos) {
case 0:
if (filler(retp, ".", 1, fp->f_pos, ip->i_ino, DT_DIR) < 0)
goto out;
fp->f_pos++;
/* fallthrough */
case 1:
if (filler(retp, "..", 2, fp->f_pos, VXFS_INO(ip)->vii_dotdot, DT_DIR) < 0)
goto out;
fp->f_pos++;
/* fallthrough */
}
pos = fp->f_pos - 2;
if (pos > VXFS_DIRROUND(ip->i_size))
return 0;
npages = dir_pages(ip);
nblocks = dir_blocks(ip);
pblocks = VXFS_BLOCK_PER_PAGE(sbp);
page = pos >> PAGE_CACHE_SHIFT;
offset = pos & ~PAGE_CACHE_MASK;
block = (u_long)(pos >> sbp->s_blocksize_bits) % pblocks;
for (; page < npages; page++, block = 0) {
caddr_t kaddr;
struct page *pp;
pp = vxfs_get_page(ip->i_mapping, page);
if (IS_ERR(pp))
continue;
kaddr = (caddr_t)page_address(pp);
for (; block <= nblocks && block <= pblocks; block++) {
caddr_t baddr, limit;
struct vxfs_dirblk *dbp;
struct vxfs_direct *de;
baddr = kaddr + (block * bsize);
limit = baddr + bsize - VXFS_DIRLEN(1);
dbp = (struct vxfs_dirblk *)baddr;
de = (struct vxfs_direct *)
(offset ?
(kaddr + offset) :
(baddr + VXFS_DIRBLKOV(dbp)));
for (; (caddr_t)de <= limit; de = vxfs_next_entry(de)) {
int over;
if (!de->d_reclen)
break;
if (!de->d_ino)
continue;
offset = (caddr_t)de - kaddr;
over = filler(retp, de->d_name, de->d_namelen,
((page << PAGE_CACHE_SHIFT) | offset) + 2,
de->d_ino, DT_UNKNOWN);
if (over) {
vxfs_put_page(pp);
goto done;
}
}
offset = 0;
}
vxfs_put_page(pp);
offset = 0;
}
done:
fp->f_pos = ((page << PAGE_CACHE_SHIFT) | offset) + 2;
out:
return 0;
}
/**
* vxfs_readdir - read a directory
* @fp: the directory to read
* @retp: return buffer
* @filler: filldir callback
*
* Description:
* vxfs_readdir fills @retp with directory entries from @fp
* using the VFS supplied callback @filler.
*
* Returns:
* Zero.
*/
static int
vxfs_readdir(struct file *fp, struct dir_context *ctx)
{
struct inode *ip = file_inode(fp);
struct super_block *sbp = ip->i_sb;
u_long bsize = sbp->s_blocksize;
u_long page, npages, block, pblocks, nblocks, offset;
loff_t pos;
if (ctx->pos == 0) {
if (!dir_emit_dot(fp, ctx))
return 0;
ctx->pos = 1;
}
if (ctx->pos == 1) {
if (!dir_emit(ctx, "..", 2, VXFS_INO(ip)->vii_dotdot, DT_DIR))
return 0;
ctx->pos = 2;
}
pos = ctx->pos - 2;
if (pos > VXFS_DIRROUND(ip->i_size))
return 0;
npages = dir_pages(ip);
nblocks = dir_blocks(ip);
pblocks = VXFS_BLOCK_PER_PAGE(sbp);
page = pos >> PAGE_CACHE_SHIFT;
offset = pos & ~PAGE_CACHE_MASK;
block = (u_long)(pos >> sbp->s_blocksize_bits) % pblocks;
for (; page < npages; page++, block = 0) {
char *kaddr;
struct page *pp;
pp = vxfs_get_page(ip->i_mapping, page);
if (IS_ERR(pp))
continue;
kaddr = (char *)page_address(pp);
for (; block <= nblocks && block <= pblocks; block++) {
char *baddr, *limit;
struct vxfs_dirblk *dbp;
struct vxfs_direct *de;
baddr = kaddr + (block * bsize);
limit = baddr + bsize - VXFS_DIRLEN(1);
dbp = (struct vxfs_dirblk *)baddr;
de = (struct vxfs_direct *)
(offset ?
(kaddr + offset) :
(baddr + VXFS_DIRBLKOV(dbp)));
for (; (char *)de <= limit; de = vxfs_next_entry(de)) {
if (!de->d_reclen)
break;
if (!de->d_ino)
continue;
offset = (char *)de - kaddr;
ctx->pos = ((page << PAGE_CACHE_SHIFT) | offset) + 2;
if (!dir_emit(ctx, de->d_name, de->d_namelen,
de->d_ino, DT_UNKNOWN)) {
vxfs_put_page(pp);
return 0;
}
}
offset = 0;
}
vxfs_put_page(pp);
offset = 0;
}
ctx->pos = ((page << PAGE_CACHE_SHIFT) | offset) + 2;
return 0;
}