1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162 |
- /*
- * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
- *
- * This copyrighted material is made available to anyone wishing to use,
- * modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License version 2.
- */
- #include <linux/slab.h>
- #include <linux/spinlock.h>
- #include <linux/completion.h>
- #include <linux/buffer_head.h>
- #include <linux/pagemap.h>
- #include <linux/uio.h>
- #include <linux/blkdev.h>
- #include <linux/mm.h>
- #include <linux/mount.h>
- #include <linux/fs.h>
- #include <linux/gfs2_ondisk.h>
- #include <linux/falloc.h>
- #include <linux/swap.h>
- #include <linux/crc32.h>
- #include <linux/writeback.h>
- #include <asm/uaccess.h>
- #include <linux/dlm.h>
- #include <linux/dlm_plock.h>
- #include <linux/delay.h>
- #include "gfs2.h"
- #include "incore.h"
- #include "bmap.h"
- #include "dir.h"
- #include "glock.h"
- #include "glops.h"
- #include "inode.h"
- #include "log.h"
- #include "meta_io.h"
- #include "quota.h"
- #include "rgrp.h"
- #include "trans.h"
- #include "util.h"
- /**
- * gfs2_llseek - seek to a location in a file
- * @file: the file
- * @offset: the offset
- * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
- *
- * SEEK_END requires the glock for the file because it references the
- * file's size.
- *
- * Returns: The new offset, or errno
- */
- static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
- {
- struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
- struct gfs2_holder i_gh;
- loff_t error;
- switch (whence) {
- case SEEK_END: /* These reference inode->i_size */
- case SEEK_DATA:
- case SEEK_HOLE:
- error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
- &i_gh);
- if (!error) {
- error = generic_file_llseek(file, offset, whence);
- gfs2_glock_dq_uninit(&i_gh);
- }
- break;
- case SEEK_CUR:
- case SEEK_SET:
- error = generic_file_llseek(file, offset, whence);
- break;
- default:
- error = -EINVAL;
- }
- return error;
- }
- /**
- * gfs2_readdir - Iterator for a directory
- * @file: The directory to read from
- * @ctx: What to feed directory entries to
- *
- * Returns: errno
- */
- static int gfs2_readdir(struct file *file, struct dir_context *ctx)
- {
- struct inode *dir = file->f_mapping->host;
- struct gfs2_inode *dip = GFS2_I(dir);
- struct gfs2_holder d_gh;
- int error;
- error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
- if (error)
- return error;
- error = gfs2_dir_read(dir, ctx, &file->f_ra);
- gfs2_glock_dq_uninit(&d_gh);
- return error;
- }
- /**
- * fsflags_cvt
- * @table: A table of 32 u32 flags
- * @val: a 32 bit value to convert
- *
- * This function can be used to convert between fsflags values and
- * GFS2's own flags values.
- *
- * Returns: the converted flags
- */
- static u32 fsflags_cvt(const u32 *table, u32 val)
- {
- u32 res = 0;
- while(val) {
- if (val & 1)
- res |= *table;
- table++;
- val >>= 1;
- }
- return res;
- }
- static const u32 fsflags_to_gfs2[32] = {
- [3] = GFS2_DIF_SYNC,
- [4] = GFS2_DIF_IMMUTABLE,
- [5] = GFS2_DIF_APPENDONLY,
- [7] = GFS2_DIF_NOATIME,
- [12] = GFS2_DIF_EXHASH,
- [14] = GFS2_DIF_INHERIT_JDATA,
- [17] = GFS2_DIF_TOPDIR,
- };
- static const u32 gfs2_to_fsflags[32] = {
- [gfs2fl_Sync] = FS_SYNC_FL,
- [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
- [gfs2fl_AppendOnly] = FS_APPEND_FL,
- [gfs2fl_NoAtime] = FS_NOATIME_FL,
- [gfs2fl_ExHash] = FS_INDEX_FL,
- [gfs2fl_TopLevel] = FS_TOPDIR_FL,
- [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
- };
- static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
- {
- struct inode *inode = file_inode(filp);
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_holder gh;
- int error;
- u32 fsflags;
- gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
- error = gfs2_glock_nq(&gh);
- if (error)
- return error;
- fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
- if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
- fsflags |= FS_JOURNAL_DATA_FL;
- if (put_user(fsflags, ptr))
- error = -EFAULT;
- gfs2_glock_dq(&gh);
- gfs2_holder_uninit(&gh);
- return error;
- }
- void gfs2_set_inode_flags(struct inode *inode)
- {
- struct gfs2_inode *ip = GFS2_I(inode);
- unsigned int flags = inode->i_flags;
- flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
- if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
- flags |= S_NOSEC;
- if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
- flags |= S_IMMUTABLE;
- if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
- flags |= S_APPEND;
- if (ip->i_diskflags & GFS2_DIF_NOATIME)
- flags |= S_NOATIME;
- if (ip->i_diskflags & GFS2_DIF_SYNC)
- flags |= S_SYNC;
- inode->i_flags = flags;
- }
- /* Flags that can be set by user space */
- #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
- GFS2_DIF_IMMUTABLE| \
- GFS2_DIF_APPENDONLY| \
- GFS2_DIF_NOATIME| \
- GFS2_DIF_SYNC| \
- GFS2_DIF_SYSTEM| \
- GFS2_DIF_TOPDIR| \
- GFS2_DIF_INHERIT_JDATA)
- /**
- * do_gfs2_set_flags - set flags on an inode
- * @filp: file pointer
- * @reqflags: The flags to set
- * @mask: Indicates which flags are valid
- *
- */
- static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
- {
- struct inode *inode = file_inode(filp);
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_sbd *sdp = GFS2_SB(inode);
- struct buffer_head *bh;
- struct gfs2_holder gh;
- int error;
- u32 new_flags, flags;
- error = mnt_want_write_file(filp);
- if (error)
- return error;
- error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
- if (error)
- goto out_drop_write;
- error = -EACCES;
- if (!inode_owner_or_capable(inode))
- goto out;
- error = 0;
- flags = ip->i_diskflags;
- new_flags = (flags & ~mask) | (reqflags & mask);
- if ((new_flags ^ flags) == 0)
- goto out;
- error = -EINVAL;
- if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
- goto out;
- error = -EPERM;
- if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
- goto out;
- if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
- goto out;
- if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
- !capable(CAP_LINUX_IMMUTABLE))
- goto out;
- if (!IS_IMMUTABLE(inode)) {
- error = gfs2_permission(inode, MAY_WRITE);
- if (error)
- goto out;
- }
- if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
- if (new_flags & GFS2_DIF_JDATA)
- gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
- error = filemap_fdatawrite(inode->i_mapping);
- if (error)
- goto out;
- error = filemap_fdatawait(inode->i_mapping);
- if (error)
- goto out;
- if (new_flags & GFS2_DIF_JDATA)
- gfs2_ordered_del_inode(ip);
- }
- error = gfs2_trans_begin(sdp, RES_DINODE, 0);
- if (error)
- goto out;
- error = gfs2_meta_inode_buffer(ip, &bh);
- if (error)
- goto out_trans_end;
- gfs2_trans_add_meta(ip->i_gl, bh);
- ip->i_diskflags = new_flags;
- gfs2_dinode_out(ip, bh->b_data);
- brelse(bh);
- gfs2_set_inode_flags(inode);
- gfs2_set_aops(inode);
- out_trans_end:
- gfs2_trans_end(sdp);
- out:
- gfs2_glock_dq_uninit(&gh);
- out_drop_write:
- mnt_drop_write_file(filp);
- return error;
- }
- static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
- {
- struct inode *inode = file_inode(filp);
- u32 fsflags, gfsflags;
- if (get_user(fsflags, ptr))
- return -EFAULT;
- gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
- if (!S_ISDIR(inode->i_mode)) {
- gfsflags &= ~GFS2_DIF_TOPDIR;
- if (gfsflags & GFS2_DIF_INHERIT_JDATA)
- gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
- return do_gfs2_set_flags(filp, gfsflags, ~0);
- }
- return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
- }
- static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
- {
- switch(cmd) {
- case FS_IOC_GETFLAGS:
- return gfs2_get_flags(filp, (u32 __user *)arg);
- case FS_IOC_SETFLAGS:
- return gfs2_set_flags(filp, (u32 __user *)arg);
- case FITRIM:
- return gfs2_fitrim(filp, (void __user *)arg);
- }
- return -ENOTTY;
- }
- /**
- * gfs2_size_hint - Give a hint to the size of a write request
- * @filep: The struct file
- * @offset: The file offset of the write
- * @size: The length of the write
- *
- * When we are about to do a write, this function records the total
- * write size in order to provide a suitable hint to the lower layers
- * about how many blocks will be required.
- *
- */
- static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
- {
- struct inode *inode = file_inode(filep);
- struct gfs2_sbd *sdp = GFS2_SB(inode);
- struct gfs2_inode *ip = GFS2_I(inode);
- size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
- int hint = min_t(size_t, INT_MAX, blks);
- if (hint > atomic_read(&ip->i_res->rs_sizehint))
- atomic_set(&ip->i_res->rs_sizehint, hint);
- }
- /**
- * gfs2_allocate_page_backing - Use bmap to allocate blocks
- * @page: The (locked) page to allocate backing for
- *
- * We try to allocate all the blocks required for the page in
- * one go. This might fail for various reasons, so we keep
- * trying until all the blocks to back this page are allocated.
- * If some of the blocks are already allocated, thats ok too.
- */
- static int gfs2_allocate_page_backing(struct page *page)
- {
- struct inode *inode = page->mapping->host;
- struct buffer_head bh;
- unsigned long size = PAGE_CACHE_SIZE;
- u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
- do {
- bh.b_state = 0;
- bh.b_size = size;
- gfs2_block_map(inode, lblock, &bh, 1);
- if (!buffer_mapped(&bh))
- return -EIO;
- size -= bh.b_size;
- lblock += (bh.b_size >> inode->i_blkbits);
- } while(size > 0);
- return 0;
- }
- /**
- * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
- * @vma: The virtual memory area
- * @vmf: The virtual memory fault containing the page to become writable
- *
- * When the page becomes writable, we need to ensure that we have
- * blocks allocated on disk to back that page.
- */
- static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
- {
- struct page *page = vmf->page;
- struct inode *inode = file_inode(vma->vm_file);
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_sbd *sdp = GFS2_SB(inode);
- struct gfs2_alloc_parms ap = { .aflags = 0, };
- unsigned long last_index;
- u64 pos = page->index << PAGE_CACHE_SHIFT;
- unsigned int data_blocks, ind_blocks, rblocks;
- struct gfs2_holder gh;
- loff_t size;
- int ret;
- sb_start_pagefault(inode->i_sb);
- /* Update file times before taking page lock */
- file_update_time(vma->vm_file);
- ret = get_write_access(inode);
- if (ret)
- goto out;
- ret = gfs2_rs_alloc(ip);
- if (ret)
- goto out_write_access;
- gfs2_size_hint(vma->vm_file, pos, PAGE_CACHE_SIZE);
- gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
- ret = gfs2_glock_nq(&gh);
- if (ret)
- goto out_uninit;
- set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
- set_bit(GIF_SW_PAGED, &ip->i_flags);
- if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) {
- lock_page(page);
- if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
- ret = -EAGAIN;
- unlock_page(page);
- }
- goto out_unlock;
- }
- ret = gfs2_rindex_update(sdp);
- if (ret)
- goto out_unlock;
- gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
- ap.target = data_blocks + ind_blocks;
- ret = gfs2_quota_lock_check(ip, &ap);
- if (ret)
- goto out_unlock;
- ret = gfs2_inplace_reserve(ip, &ap);
- if (ret)
- goto out_quota_unlock;
- rblocks = RES_DINODE + ind_blocks;
- if (gfs2_is_jdata(ip))
- rblocks += data_blocks ? data_blocks : 1;
- if (ind_blocks || data_blocks) {
- rblocks += RES_STATFS + RES_QUOTA;
- rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
- }
- ret = gfs2_trans_begin(sdp, rblocks, 0);
- if (ret)
- goto out_trans_fail;
- lock_page(page);
- ret = -EINVAL;
- size = i_size_read(inode);
- last_index = (size - 1) >> PAGE_CACHE_SHIFT;
- /* Check page index against inode size */
- if (size == 0 || (page->index > last_index))
- goto out_trans_end;
- ret = -EAGAIN;
- /* If truncated, we must retry the operation, we may have raced
- * with the glock demotion code.
- */
- if (!PageUptodate(page) || page->mapping != inode->i_mapping)
- goto out_trans_end;
- /* Unstuff, if required, and allocate backing blocks for page */
- ret = 0;
- if (gfs2_is_stuffed(ip))
- ret = gfs2_unstuff_dinode(ip, page);
- if (ret == 0)
- ret = gfs2_allocate_page_backing(page);
- out_trans_end:
- if (ret)
- unlock_page(page);
- gfs2_trans_end(sdp);
- out_trans_fail:
- gfs2_inplace_release(ip);
- out_quota_unlock:
- gfs2_quota_unlock(ip);
- out_unlock:
- gfs2_glock_dq(&gh);
- out_uninit:
- gfs2_holder_uninit(&gh);
- if (ret == 0) {
- set_page_dirty(page);
- wait_for_stable_page(page);
- }
- out_write_access:
- put_write_access(inode);
- out:
- sb_end_pagefault(inode->i_sb);
- return block_page_mkwrite_return(ret);
- }
- static const struct vm_operations_struct gfs2_vm_ops = {
- .fault = filemap_fault,
- .map_pages = filemap_map_pages,
- .page_mkwrite = gfs2_page_mkwrite,
- };
- /**
- * gfs2_mmap -
- * @file: The file to map
- * @vma: The VMA which described the mapping
- *
- * There is no need to get a lock here unless we should be updating
- * atime. We ignore any locking errors since the only consequence is
- * a missed atime update (which will just be deferred until later).
- *
- * Returns: 0
- */
- static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
- {
- struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
- if (!(file->f_flags & O_NOATIME) &&
- !IS_NOATIME(&ip->i_inode)) {
- struct gfs2_holder i_gh;
- int error;
- error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
- &i_gh);
- if (error)
- return error;
- /* grab lock to update inode */
- gfs2_glock_dq_uninit(&i_gh);
- file_accessed(file);
- }
- vma->vm_ops = &gfs2_vm_ops;
- return 0;
- }
- /**
- * gfs2_open_common - This is common to open and atomic_open
- * @inode: The inode being opened
- * @file: The file being opened
- *
- * This maybe called under a glock or not depending upon how it has
- * been called. We must always be called under a glock for regular
- * files, however. For other file types, it does not matter whether
- * we hold the glock or not.
- *
- * Returns: Error code or 0 for success
- */
- int gfs2_open_common(struct inode *inode, struct file *file)
- {
- struct gfs2_file *fp;
- int ret;
- if (S_ISREG(inode->i_mode)) {
- ret = generic_file_open(inode, file);
- if (ret)
- return ret;
- }
- fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
- if (!fp)
- return -ENOMEM;
- mutex_init(&fp->f_fl_mutex);
- gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
- file->private_data = fp;
- return 0;
- }
- /**
- * gfs2_open - open a file
- * @inode: the inode to open
- * @file: the struct file for this opening
- *
- * After atomic_open, this function is only used for opening files
- * which are already cached. We must still get the glock for regular
- * files to ensure that we have the file size uptodate for the large
- * file check which is in the common code. That is only an issue for
- * regular files though.
- *
- * Returns: errno
- */
- static int gfs2_open(struct inode *inode, struct file *file)
- {
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_holder i_gh;
- int error;
- bool need_unlock = false;
- if (S_ISREG(ip->i_inode.i_mode)) {
- error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
- &i_gh);
- if (error)
- return error;
- need_unlock = true;
- }
- error = gfs2_open_common(inode, file);
- if (need_unlock)
- gfs2_glock_dq_uninit(&i_gh);
- return error;
- }
- /**
- * gfs2_release - called to close a struct file
- * @inode: the inode the struct file belongs to
- * @file: the struct file being closed
- *
- * Returns: errno
- */
- static int gfs2_release(struct inode *inode, struct file *file)
- {
- struct gfs2_inode *ip = GFS2_I(inode);
- kfree(file->private_data);
- file->private_data = NULL;
- if (!(file->f_mode & FMODE_WRITE))
- return 0;
- gfs2_rs_delete(ip, &inode->i_writecount);
- return 0;
- }
- /**
- * gfs2_fsync - sync the dirty data for a file (across the cluster)
- * @file: the file that points to the dentry
- * @start: the start position in the file to sync
- * @end: the end position in the file to sync
- * @datasync: set if we can ignore timestamp changes
- *
- * We split the data flushing here so that we don't wait for the data
- * until after we've also sent the metadata to disk. Note that for
- * data=ordered, we will write & wait for the data at the log flush
- * stage anyway, so this is unlikely to make much of a difference
- * except in the data=writeback case.
- *
- * If the fdatawrite fails due to any reason except -EIO, we will
- * continue the remainder of the fsync, although we'll still report
- * the error at the end. This is to match filemap_write_and_wait_range()
- * behaviour.
- *
- * Returns: errno
- */
- static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
- int datasync)
- {
- struct address_space *mapping = file->f_mapping;
- struct inode *inode = mapping->host;
- int sync_state = inode->i_state & I_DIRTY_ALL;
- struct gfs2_inode *ip = GFS2_I(inode);
- int ret = 0, ret1 = 0;
- if (mapping->nrpages) {
- ret1 = filemap_fdatawrite_range(mapping, start, end);
- if (ret1 == -EIO)
- return ret1;
- }
- if (!gfs2_is_jdata(ip))
- sync_state &= ~I_DIRTY_PAGES;
- if (datasync)
- sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME);
- if (sync_state) {
- ret = sync_inode_metadata(inode, 1);
- if (ret)
- return ret;
- if (gfs2_is_jdata(ip))
- filemap_write_and_wait(mapping);
- gfs2_ail_flush(ip->i_gl, 1);
- }
- if (mapping->nrpages)
- ret = filemap_fdatawait_range(mapping, start, end);
- return ret ? ret : ret1;
- }
- /**
- * gfs2_file_write_iter - Perform a write to a file
- * @iocb: The io context
- * @iov: The data to write
- * @nr_segs: Number of @iov segments
- * @pos: The file position
- *
- * We have to do a lock/unlock here to refresh the inode size for
- * O_APPEND writes, otherwise we can land up writing at the wrong
- * offset. There is still a race, but provided the app is using its
- * own file locking, this will make O_APPEND work as expected.
- *
- */
- static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
- {
- struct file *file = iocb->ki_filp;
- struct gfs2_inode *ip = GFS2_I(file_inode(file));
- int ret;
- ret = gfs2_rs_alloc(ip);
- if (ret)
- return ret;
- gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
- if (iocb->ki_flags & IOCB_APPEND) {
- struct gfs2_holder gh;
- ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
- if (ret)
- return ret;
- gfs2_glock_dq_uninit(&gh);
- }
- return generic_file_write_iter(iocb, from);
- }
- static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
- int mode)
- {
- struct gfs2_inode *ip = GFS2_I(inode);
- struct buffer_head *dibh;
- int error;
- unsigned int nr_blks;
- sector_t lblock = offset >> inode->i_blkbits;
- error = gfs2_meta_inode_buffer(ip, &dibh);
- if (unlikely(error))
- return error;
- gfs2_trans_add_meta(ip->i_gl, dibh);
- if (gfs2_is_stuffed(ip)) {
- error = gfs2_unstuff_dinode(ip, NULL);
- if (unlikely(error))
- goto out;
- }
- while (len) {
- struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
- bh_map.b_size = len;
- set_buffer_zeronew(&bh_map);
- error = gfs2_block_map(inode, lblock, &bh_map, 1);
- if (unlikely(error))
- goto out;
- len -= bh_map.b_size;
- nr_blks = bh_map.b_size >> inode->i_blkbits;
- lblock += nr_blks;
- if (!buffer_new(&bh_map))
- continue;
- if (unlikely(!buffer_zeronew(&bh_map))) {
- error = -EIO;
- goto out;
- }
- }
- out:
- brelse(dibh);
- return error;
- }
- /**
- * calc_max_reserv() - Reverse of write_calc_reserv. Given a number of
- * blocks, determine how many bytes can be written.
- * @ip: The inode in question.
- * @len: Max cap of bytes. What we return in *len must be <= this.
- * @data_blocks: Compute and return the number of data blocks needed
- * @ind_blocks: Compute and return the number of indirect blocks needed
- * @max_blocks: The total blocks available to work with.
- *
- * Returns: void, but @len, @data_blocks and @ind_blocks are filled in.
- */
- static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
- unsigned int *data_blocks, unsigned int *ind_blocks,
- unsigned int max_blocks)
- {
- loff_t max = *len;
- const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
- unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
- for (tmp = max_data; tmp > sdp->sd_diptrs;) {
- tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
- max_data -= tmp;
- }
- *data_blocks = max_data;
- *ind_blocks = max_blocks - max_data;
- *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
- if (*len > max) {
- *len = max;
- gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
- }
- }
- static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
- {
- struct inode *inode = file_inode(file);
- struct gfs2_sbd *sdp = GFS2_SB(inode);
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_alloc_parms ap = { .aflags = 0, };
- unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
- loff_t bytes, max_bytes, max_blks;
- int error;
- const loff_t pos = offset;
- const loff_t count = len;
- loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
- loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
- loff_t max_chunk_size = UINT_MAX & bsize_mask;
- next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
- offset &= bsize_mask;
- len = next - offset;
- bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
- if (!bytes)
- bytes = UINT_MAX;
- bytes &= bsize_mask;
- if (bytes == 0)
- bytes = sdp->sd_sb.sb_bsize;
- gfs2_size_hint(file, offset, len);
- gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
- ap.min_target = data_blocks + ind_blocks;
- while (len > 0) {
- if (len < bytes)
- bytes = len;
- if (!gfs2_write_alloc_required(ip, offset, bytes)) {
- len -= bytes;
- offset += bytes;
- continue;
- }
- /* We need to determine how many bytes we can actually
- * fallocate without exceeding quota or going over the
- * end of the fs. We start off optimistically by assuming
- * we can write max_bytes */
- max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
- /* Since max_bytes is most likely a theoretical max, we
- * calculate a more realistic 'bytes' to serve as a good
- * starting point for the number of bytes we may be able
- * to write */
- gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
- ap.target = data_blocks + ind_blocks;
- error = gfs2_quota_lock_check(ip, &ap);
- if (error)
- return error;
- /* ap.allowed tells us how many blocks quota will allow
- * us to write. Check if this reduces max_blks */
- max_blks = UINT_MAX;
- if (ap.allowed)
- max_blks = ap.allowed;
- error = gfs2_inplace_reserve(ip, &ap);
- if (error)
- goto out_qunlock;
- /* check if the selected rgrp limits our max_blks further */
- if (ap.allowed && ap.allowed < max_blks)
- max_blks = ap.allowed;
- /* Almost done. Calculate bytes that can be written using
- * max_blks. We also recompute max_bytes, data_blocks and
- * ind_blocks */
- calc_max_reserv(ip, &max_bytes, &data_blocks,
- &ind_blocks, max_blks);
- rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
- RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
- if (gfs2_is_jdata(ip))
- rblocks += data_blocks ? data_blocks : 1;
- error = gfs2_trans_begin(sdp, rblocks,
- PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
- if (error)
- goto out_trans_fail;
- error = fallocate_chunk(inode, offset, max_bytes, mode);
- gfs2_trans_end(sdp);
- if (error)
- goto out_trans_fail;
- len -= max_bytes;
- offset += max_bytes;
- gfs2_inplace_release(ip);
- gfs2_quota_unlock(ip);
- }
- if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size) {
- i_size_write(inode, pos + count);
- file_update_time(file);
- mark_inode_dirty(inode);
- }
- return generic_write_sync(file, pos, count);
- out_trans_fail:
- gfs2_inplace_release(ip);
- out_qunlock:
- gfs2_quota_unlock(ip);
- return error;
- }
- static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
- {
- struct inode *inode = file_inode(file);
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_holder gh;
- int ret;
- if ((mode & ~FALLOC_FL_KEEP_SIZE) || gfs2_is_jdata(ip))
- return -EOPNOTSUPP;
- mutex_lock(&inode->i_mutex);
- gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
- ret = gfs2_glock_nq(&gh);
- if (ret)
- goto out_uninit;
- if (!(mode & FALLOC_FL_KEEP_SIZE) &&
- (offset + len) > inode->i_size) {
- ret = inode_newsize_ok(inode, offset + len);
- if (ret)
- goto out_unlock;
- }
- ret = get_write_access(inode);
- if (ret)
- goto out_unlock;
- ret = gfs2_rs_alloc(ip);
- if (ret)
- goto out_putw;
- ret = __gfs2_fallocate(file, mode, offset, len);
- if (ret)
- gfs2_rs_deltree(ip->i_res);
- out_putw:
- put_write_access(inode);
- out_unlock:
- gfs2_glock_dq(&gh);
- out_uninit:
- gfs2_holder_uninit(&gh);
- mutex_unlock(&inode->i_mutex);
- return ret;
- }
- static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
- struct file *out, loff_t *ppos,
- size_t len, unsigned int flags)
- {
- int error;
- struct gfs2_inode *ip = GFS2_I(out->f_mapping->host);
- error = gfs2_rs_alloc(ip);
- if (error)
- return (ssize_t)error;
- gfs2_size_hint(out, *ppos, len);
- return iter_file_splice_write(pipe, out, ppos, len, flags);
- }
- #ifdef CONFIG_GFS2_FS_LOCKING_DLM
- /**
- * gfs2_lock - acquire/release a posix lock on a file
- * @file: the file pointer
- * @cmd: either modify or retrieve lock state, possibly wait
- * @fl: type and range of lock
- *
- * Returns: errno
- */
- static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
- {
- struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
- struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
- struct lm_lockstruct *ls = &sdp->sd_lockstruct;
- if (!(fl->fl_flags & FL_POSIX))
- return -ENOLCK;
- if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
- return -ENOLCK;
- if (cmd == F_CANCELLK) {
- /* Hack: */
- cmd = F_SETLK;
- fl->fl_type = F_UNLCK;
- }
- if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
- if (fl->fl_type == F_UNLCK)
- locks_lock_file_wait(file, fl);
- return -EIO;
- }
- if (IS_GETLK(cmd))
- return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
- else if (fl->fl_type == F_UNLCK)
- return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
- else
- return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
- }
- static int do_flock(struct file *file, int cmd, struct file_lock *fl)
- {
- struct gfs2_file *fp = file->private_data;
- struct gfs2_holder *fl_gh = &fp->f_fl_gh;
- struct gfs2_inode *ip = GFS2_I(file_inode(file));
- struct gfs2_glock *gl;
- unsigned int state;
- int flags;
- int error = 0;
- int sleeptime;
- state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
- flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
- mutex_lock(&fp->f_fl_mutex);
- gl = fl_gh->gh_gl;
- if (gl) {
- if (fl_gh->gh_state == state)
- goto out;
- locks_lock_file_wait(file,
- &(struct file_lock){.fl_type = F_UNLCK});
- gfs2_glock_dq(fl_gh);
- gfs2_holder_reinit(state, flags, fl_gh);
- } else {
- error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
- &gfs2_flock_glops, CREATE, &gl);
- if (error)
- goto out;
- gfs2_holder_init(gl, state, flags, fl_gh);
- gfs2_glock_put(gl);
- }
- for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
- error = gfs2_glock_nq(fl_gh);
- if (error != GLR_TRYFAILED)
- break;
- fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
- fl_gh->gh_error = 0;
- msleep(sleeptime);
- }
- if (error) {
- gfs2_holder_uninit(fl_gh);
- if (error == GLR_TRYFAILED)
- error = -EAGAIN;
- } else {
- error = locks_lock_file_wait(file, fl);
- gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
- }
- out:
- mutex_unlock(&fp->f_fl_mutex);
- return error;
- }
- static void do_unflock(struct file *file, struct file_lock *fl)
- {
- struct gfs2_file *fp = file->private_data;
- struct gfs2_holder *fl_gh = &fp->f_fl_gh;
- mutex_lock(&fp->f_fl_mutex);
- locks_lock_file_wait(file, fl);
- if (fl_gh->gh_gl) {
- gfs2_glock_dq(fl_gh);
- gfs2_holder_uninit(fl_gh);
- }
- mutex_unlock(&fp->f_fl_mutex);
- }
- /**
- * gfs2_flock - acquire/release a flock lock on a file
- * @file: the file pointer
- * @cmd: either modify or retrieve lock state, possibly wait
- * @fl: type and range of lock
- *
- * Returns: errno
- */
- static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
- {
- if (!(fl->fl_flags & FL_FLOCK))
- return -ENOLCK;
- if (fl->fl_type & LOCK_MAND)
- return -EOPNOTSUPP;
- if (fl->fl_type == F_UNLCK) {
- do_unflock(file, fl);
- return 0;
- } else {
- return do_flock(file, cmd, fl);
- }
- }
- const struct file_operations gfs2_file_fops = {
- .llseek = gfs2_llseek,
- .read_iter = generic_file_read_iter,
- .write_iter = gfs2_file_write_iter,
- .unlocked_ioctl = gfs2_ioctl,
- .mmap = gfs2_mmap,
- .open = gfs2_open,
- .release = gfs2_release,
- .fsync = gfs2_fsync,
- .lock = gfs2_lock,
- .flock = gfs2_flock,
- .splice_read = generic_file_splice_read,
- .splice_write = gfs2_file_splice_write,
- .setlease = simple_nosetlease,
- .fallocate = gfs2_fallocate,
- };
- const struct file_operations gfs2_dir_fops = {
- .iterate = gfs2_readdir,
- .unlocked_ioctl = gfs2_ioctl,
- .open = gfs2_open,
- .release = gfs2_release,
- .fsync = gfs2_fsync,
- .lock = gfs2_lock,
- .flock = gfs2_flock,
- .llseek = default_llseek,
- };
- #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
- const struct file_operations gfs2_file_fops_nolock = {
- .llseek = gfs2_llseek,
- .read_iter = generic_file_read_iter,
- .write_iter = gfs2_file_write_iter,
- .unlocked_ioctl = gfs2_ioctl,
- .mmap = gfs2_mmap,
- .open = gfs2_open,
- .release = gfs2_release,
- .fsync = gfs2_fsync,
- .splice_read = generic_file_splice_read,
- .splice_write = gfs2_file_splice_write,
- .setlease = generic_setlease,
- .fallocate = gfs2_fallocate,
- };
- const struct file_operations gfs2_dir_fops_nolock = {
- .iterate = gfs2_readdir,
- .unlocked_ioctl = gfs2_ioctl,
- .open = gfs2_open,
- .release = gfs2_release,
- .fsync = gfs2_fsync,
- .llseek = default_llseek,
- };
|